A-B DH-485 communication port

how can i connect the DH-485 port of A-B link coupler to my computer? do i need to purchase a RS 485/232 converter?

I believe you will need the 1784-KTX card in your PC. You then connect the DH485 port on the PLC to this card.
I am not sure if you can just use the regular 485-232 converter. Even if that works, I bet you will be talking the DF1 protocol and not DH485.
You may want to contact Allen-Bradley directly for a more definitive answer.
Regards,
Khalid

Similar Messages

How to force the "Bluetooth Communications Port" to be one of COM1 to COM8 ports?

Dear Lenovo Community, Happy Holidays to you all and wish you a great happy new year. Recently purchased a Bluetooth OBDII device and have difficulty making it to work with its provided software on my T61 (running original XP Home). My short story and question/problem is that I can open "My Bluetooth Places" and pair with the OBDII device as an "OBDII SPP Dev", but my T61 assigns serial port COM19 to it. The OBDII software which came with the device only can let user set to one of the COM1 to COM8 ports and in the properties of Bluetooth pairing, there is no way that I can select which COM port to use. I looked at the Device Manager and I do see these COM port assignments: COM4,5,6,7: Sierra Wireless (the HSDA modem in the laptop which I have never used BTW) COM 9,10,11,12,13,14,15,16,17: Bluetooth Serial Port COM 18, 19: Bluetooth Communications Port and I don't see anything for COM1,2,3, and 8 My question is how to force the computer/OS to assign one of the COM1 to COM8 ports to my device upon pairing? Can I disable the Sierra Wireless model from the COM ports list and hope this will happen? Thanks for your help and inputs beforehand. Regards, AL

Hi, AL_K
Have you attempted to change the port number in device manager itself? If you navigate to Device Manager and open the list of Ports, you can right-click on the device you wish to assign a different port number. After right-clicking, click Properties. There should be a tab called Port Settings. In here, you should find a setting to manually assign a port number.
Good luck, and let me know how it goes,
Adam
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Modifier paramètres de communication port série

Bonjour a tous,
Je souhaite réaliser un programme sous Labview pour communiquer avec un système à l'aide d'un port série. Pour cela, j'ai besoin de modifier certains paramètres de connexion cf ci-joint :
IOCTL_SERIAL_SET_QUEUE_SIZE: Set queue size
InSize=1024 *******
OutSize=1024 *******
IOCTL_SERIAL_SET_TIMEOUTS: Set timeouts
ReadIntervalTimeout=4294967295
ReadTotalTimeoutMultiplier=0
ReadTotalTimeoutConstant=0
WriteTotalTimeoutMultiplier=0
WriteTotalTimeoutConstant=65000 *******
IOCTL_SERIAL_SET_BAUD_RATE: Set baud rate
Baud Rate=9600
IOCTL_SERIAL_SET_RTS: Set RTS
IOCTL_SERIAL_SET_DTR: Set DTR
IOCTL_SERIAL_SET_LINE_CONTROL: Set line control
WordLength=7
StopBits=1 stop bit
Parity=Even parity
IOCTL_SERIAL_SET_CHARS: Set special characters
EofChar=0x0
ErrorChar=0x0
BreakChar=0x0
EventChar=0x0
XonChar=0x11
XoffChar=0x13
IOCTL_SERIAL_SET_HANDFLOW: Set handshake information
ControlHandShake=1 *******
FlowReplace=64 *******
XonLimit=10 *******
XoffLimit=10 *******
IOCTL_SERIAL_SET_HANDFLOW: Set handshake information *******
Les lignes contenant des étoiles correspondent aux paramètres que je n'arrive pas à configurer. Pour les autres, j'utilise les noeuds de propriété. Je suppose qu'il en est de même pour les paramètres manquants mais impossible de trouver. Quelqu'un aurait-il une idée ?
Merci bien.
David

Tu peux utiliser un Noeud de propriété. Voir les images ci-dessous:
Attachments:
serialSettings1.PNG ‏29 KB
serialSettings2.PNG ‏19 KB

VISA: Communicateion with "imar sensor " via serial port[

Hello
I have problem in communication. I have one sensor imar sensor that can be easily communicate in Hyperlink but if I send same command for example "show conf" it doesn't responses It is connected with rs232 in com port 1. it will be nice if you give me some suggestion thanking you
regards
Solved!
Go to Solution.

Yeah I can't open that (needs to be 2010 or earlier - see my first post)
Is 57600 baud rate the one specified in the manual for your device? This needs to be absolutely correct for the serial communications to work properly.
"If anyone needs me, I'll be in the Angry Dome!"

Can we connect xbee to cfp2020 controllers serial port for wireless communication

hi,
i wanna do data aqcuisition using ethernet as well as wireless technologies, for that i wanna use xbee with cpf 2020. is it possible?
thanks in advance

You can do it fine..
I am guessing the wireless modem is really a router as well. When you say wireless do you mean 3g internet or 4g internet or do you mean cable or adsl and a wireless modem router.?? It is just helpful to know what you are talking about by wireless modem or wireless internet.
You have that plugged into ethernet over power (EOP) adapters .. that is great.
Plugged into TV again that is fine.. although I am unclear what or how it is decoding.. is it IPTV??
Now to your specific questions.
Now, is it possible to
a) connect the Time Capsule to the powerline, so it can act as an access point? When connected to this powerline (ethernet) I hope I won't loose speed to the wireless connection
Yes, the TC needs to be bridged..
Go to manual setup of the Airport utility.. click on the internet tab.. go to connection sharing on the bottom of that page.. select off bridge mode.. update the TC.
Now you can plug the TC into the EOP adapter. And it will work as Wireless Access Point.. WAP or short AP.. and switch.
Plug the TV into the TC as well.. that should all work fine.
b) will I be able to connect my digital tv-decoder to the TC without any problems? So the TC is the decoder's "ethernet port"?
Hope this is a bit clear, as English is not my mothertongue...
IPTV can be complicated to setup and exactly how it works will depend on the main router.. sometimes IPTV is only delivered to a specific ethernet port.. in which case the above suggestion will not work.. you can use either internet or the TV.. not both..

Linux Port IO and Network Communications?

I am considering using LabVIEW for Linux for an embedded single board
computer application but have little experience with Linux.
I have written a LabVIEW driver for the analog and digital I/O ports on the
single board computer using the I/O port VIs in Windows 98. I seem to
remember discussion about a third party port I/O driver available for
LabVIEW for Linux. Is this true and where can I get it?
What is available for network communications in LabVIEW for Linux? Can you
use DataSocket? I would like to have a centralized computer, possibly
running Windows, monitoring several of these embedded computers running
Linux.
Best Regards,
Neal Pederson, President, VI Control Systems
1923 Mendius Lane, Los Alamos
, NM 87544
TEL: (505) 662-1461, FAX: (603) 388-4969
[email protected], www.vicontrols.com

Sergey Krasnishov wrote:
> TNT News wrote:
>
>> I am considering using LabVIEW for Linux for an embedded single board
>> computer application but have little experience with Linux.
>>
>> I have written a LabVIEW driver for the analog and digital I/O ports
>> on the
>> single board computer using the I/O port VIs in Windows 98. I seem to
>> remember discussion about a third party port I/O driver available for
>> LabVIEW for Linux. Is this true and where can I get it?
>>
>> What is available for network communications in LabVIEW for Linux?
>> Can you
>> use DataSocket? I would like to have a centralized computer, possibly
>> running Windows, monitoring several of these embedded computers running
>> Linux.
>>
>> Best Regards,
>>
>> Neal Pederso
n, President, VI Control Systems
>> 1923 Mendius Lane, Los Alamos, NM 87544
>> TEL: (505) 662-1461, FAX: (603) 388-4969
>> [email protected], www.vicontrols.com
>
>
> Neal,
>
> There are TCP/UDP vi's working on LV/Linux as well as Internet toolkit.
> DataSocket client vi's are on LV6/Linux only (server is still
> unavailable as far as I know).
> There is also Xserver capabilities to send data securely to remote
> client, so you can use even front panels from remote device application
> on the host machine.
>
> Port I/O may be used if you have appropriate port driver (e.g.
> /dev/name.o). In another case you'll have to make some C coding for the
> device driver.
> I saw the mention and site like "open source CIN project", but don't
> remember it's URL. There was Inport/outport vi available, made with CIN.
> If I'll find it, will let you know.
>
> Hope this helps,
Here is URL:
http://sourceforge.net/projects/cin4labview/
Sergey Krasnishov
Automated Control Systems
National Instruments Alliance Member
Moscow, Russia
[email protected]
http://acs.levsha.ru

Can Ideapad Lynx k3011 micro USB port use for data communication?

Greetings,
I would like to connect on one end an VAG-Com USB dongle (http://www.ross-tech.com/vag-com/hex-usb+can.html) via a Micro USB adaptor to the tablet and the CAN bus to my car on the other end to turn some car features on and off. Can the Micro USB port on the tablet be used as communication device to achieve this?
Thanks,

Just check ebay or http://www.parts4repair.com/brands/Sony.html
"I'd rather be hated for who I am, than loved for who I am not." Kurt Cobain (1967-1994)

Problem with serial communication PLEASE HELP

Hello everybody !
I'd like to ask You for some feedback on my wierdo problem that I got with my program.
I have built a device that detects changes in magnetic field. It is used for detecting vehicles passing it on a highway. Generally the main components communicate with each other by RS-485 protocol, but I would like to connect the device to a PC. To do so I am using a RS-232 protocol (I have a RS485=RS232 hardware converter).
Now, I made the program (even two), which generally works, BUT some wierd things are going on sometimes; it happens that I have a problem to get a communication (after that, resetting the device by un-powering it helps, sometimes I have to restart the PC as well) but overall it happens quite not so often. The project itself is for passing one of my subject on the university - so I have to run the whole thing over there, here comes another problem : the program did not work on all of the bunch of PC's that are there. Same thing happens on my notebook. The effect of 'non working' is : I am recieving same data packet that is beeing sent... BTW : notebook does not have a RS232 port and I am using a USB-RS232 calbe converter (to count it out from the reason of problems I have checked it on my main PC and it works almost fine - almost because ocasionally I am getting the same sympthomps as I mentioned before ).
Other problem is, when it works, that I am loosing communication for couple of hundreds of miliseconds and then it comes back to normal (i can see it on the osciloscope).
I alredy looked for some answears here and there, and I found some suggestions about using 'buffer cleaning method', unfortunatelly I kinda do not know how to do it, and might that help anyways ?
I also thought about using VISA drivers, but I am having trouble with it as well - the damn thing just does not work.
My very bling guess is that everyting that I am expierencing is about using the communication protocol and seting it right. I am attaching both of the programs, PLEASE anyone pretty pretty help I totally ran out of ideas and knowledge and day after day I am turning it on and off on my PC and notebook hoping some miracle will occour ...
Many many thanks in advance !
Best regards
Tom
P.S. the program is very unfinished (man things are just put in), the main thing I am struggling now is getting, and setting the communication protocol right.
Attachments:
detektor_3_2.vi ‏141 KB

The biggest problem I see is in the sequence:
Write out a string.
Wait 50 mSec.
Ask how many bytes have been received.
Read that many bytes.
Can you guarantee that the data can make a round trip in 50 mSec?
You should know that the SERIAL PORT WRITE completes NOT when the data has been sent out the port, but when it has been BUFFERED for sending. In other words it returns and starts the timer BEFORE it is actually sent.
Also, given that there are 232 -> 485 --> USB conversions involved in both directions, I would bet that you are sometimes not allowing enough time for the data to get back.
If you can control the protocol of what gets sent back, I would change your receiving logic. I think you should check for a carriage return or some other delimiter, and not react until you get that character (or until a reasonable timeout expires).
In other words, try synchronizing the two ends. Something like:
N = Get # bytes at port
Read N bytes from port (flush any characters waiting).
Write out command string.
TimeLimit = NOW + 1000 mSec (or whatever)
S = ''; (Working string)
repeat
N = #Bytes at Port
If N > 0
S = S + Read N Bytes
Found = Search String for Delimiter
until Found or (Now > TimeLimit)
If Found, parse string S
You are also re-initializing the port (SERIAL PORT INIT) every time thru the outer loop - that's unnecessary.
Steve Bird
Culverson Software - Elegant software that is a pleasure to use.
Culverson.com
Blog for (mostly LabVIEW) programmers: Tips And Tricks

Probleme communication Pt1000 et MAX

Bonjour,
J'ai un probleme de communication entre MAX et un Agilent,
Je dispose d'un agilent 34970A, d'un GPIB et d'une carte insere dans l'agilent (34901A).
Avec MAX je communique avec "communicate with instrument" en language SCPI,
J'ai reussit a connaitre les temperature de mes Pt100 4 fils et des thermocouples dont les commandes sont:
Thermocouples de type J: MEAS:TEMP? TC, J, (@203)
Pt 100, 4 fils: MEAS:TEMP? FRTD, (@201)
Mon probleme est de communiquer avec la Pt1000 sur le port CH6
J'ai essayer:
MEAS:TEMP? RTD, 85,1, 3E-06, (@206) mais on a par default la valeur d'une Pt100 2 fls
Lorsque l'on configure la resistance avec TEMP:TRAN:RTD:RES 1000, (@206) cela fonctionne car si on lui demande TEMP:TRAN:RTD:RES? (@206) on a bien les 1.0000E+03 ohms. Mais je ne peut pas demander la temperature par la suite.
Merci d'avance pour vos reponse.
If you don't understand French I can translate.

Bonjour,
Merci d'avoir posté votre question sur les forums de National Instruments.
Je pense que le problème vient de votre utilisation d’une communication de
type série. Comme vous travaillez par le biais d’un port série (communication
RS 232-485), MAX n’affiche pas votre instrument (et notamment pas dans devices
ans interfaces). Par contre vous devriez être en mesure de voir les ports
séries qui sont utilisés pour communiquer avec vos instruments (sous la
rubrique sérial & parallel).
De la même façon, vous devriez pouvoir communiquer directement avec vos
instruments (sous LabVIEW par exemple) en utilisant directement les fonctions
VISA (du driver NI-VISA).
J’espère que ces informations vous aideront à résoudre votre problème.
Bien cordialement,
Guillaume H.
National Instruments France
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>> NIDays 2011, le mardi 8 février au CNIT de Paris La Défense

How to implement Modbus Ethernet communication in Lookout, if we want to simulate the PC as PLC ?

Problem Description :
Dear Sir,
We are doing a project where we are using Lookout with
Front end Modicon PLC. The communication is by
Ethernet, using Modbus.
Since the installation is at a distant place, we wanted
to use another PC (running Lookout) to simulate the
PLC. For this, we tried to communicate
a: the server Lookout PC running Modbus Ethernet mode of
Modbus object as Master
b: with another PC (for simulating the PLC) running
Modbus Slave
We did not get any communication. (we have given the
details of what we have done, at the end of this email)
We also tried connecting the above 2 PC's as
a: the server Lookout PC running Modbus Serial mode of
Modbus object as Master
b: with another PC (for simulating the PLC) running
Modbus Slave object
Again we did not get any communication.
If instead of PC (b) we connect the Modbus simulator to
PC (a), there is no problem in communicating
Please let us know how to go about establishing the
communication between 2 PC's using Modbus serial,
and Modbus Ethernet. A detailed step by step procedure
would help us a lot.
Thanking you
Warm Regards
Raja Mahbubani
Procedure of our trial with ethernet.
This is what we have done in detail.
On PC A:
We created an object (Pot) and connected it to
the modbus data member of the modbus object say 40001. In the
properties of the modbus object we selected modbus ethernet mode
of communication and in the IP address field we wrote the IP
address of the machine B to which we are trying to communicate
i.e. 152.63.50.2.
On PC B: we tried the following two methods
Trial 1 : We created a modbus slave object and
inserted an expression for the same data memeber to which the
object was connected hoping to get the value of the pot of machine
A on machine B.
Trial 2 : We created a modbus object on machine B and we wrote
the IP address of machine A and inserted an expression for the
same datamemeber to which the object was connected hoping to get
the value of the pot of machine A on machine B.
NI Software : Lookout
Version : 4.0.1 or 4.5
OS : Windows 98
NI Hardware : N/A
Drivers : N/A
Other Hardware/Instruments : N/A
CPU : Pentium
RAM : 64
Vendor : S-Tech
Customer Information :
Raja Mahbubani
Theta Controls
IN
[email protected]
Ph: (+91) 20 4222556/7

The ModbusSlave which comes with Lookout currently supports only Serial communication. So, you cannot use Ethernet between your two PCs. At least not with Modbus Master-Slave setup (if you must speak Ethernet between the two PCs, IPASCII object lets you do that, but then you'll need to implement your own protocol).
Since all you want to do is simulate a Modbus PLC on a PC, you can use the Serial mode of communication for now. And later on just modify the Object in your Server Lookout to use the Ethernet mode.
For setting up a Serial Modbus Slave, use a null-modem cable between the two PCs (lines 2 and 3 are swapped). On your PC 'B,' create the Modbus Slave object with the right COM port for that PC. And on your PC 'A' create the regular Modbus Object as if you w
ere connecting to the Modbus Simulator box. The only difference here is the cable. The simulator box uses a straight-through cable whereas the Slave needs a null-modem cable.
Hope this helps.
Rgds,
Khalid

6500a e710 a-f - Scanner Communication Error Windows 8.1

We have been experiencing issues with scanning whilst connected via USB, using the HP Scan software. The software returns an error message saying scanner communication cannot be established, half way through scanning. Then HPScan.exe fails to load again. The printer just says “scanning cancelled” on its display.
This is only effecting one model of PC and that is a HP 8300 Ultra-Slim PC.
We are running Windows 8.1 64 bit from an image install. However, I have tested this with a fresh Windows 8.1 retail installation and get the same problem.
We have tried various actions to fix this:
- Various accounts, admin accounts, domain admin accounts, local accounts etc.
- Uninstall and reinstall. Basic and Full driver packages including the latest versions
- Removed all other HP software from PC including registry keys
- Used built in Windows 8 scan software with basic driver
- All USB ports tested including 2.0, 3.0 and powered / non-powered
- Replaced cables
- Re-isntalled USB bus drivers for 8300
- Followed the print/scan doctor which shows a driver error - scandriver unable to communicate with product
- Run HPScan in compatibility mode for 7/XP
- Updated firmware on printer
- Installed latest Windows Updates
- Checked WIA service and dependencies are running
- Semi and Full factory resets on Printer
- Shell hardware detection service set to manual
- We have replaced the printer for an affected user - same issue
- Also replaced PC for an affected user - same issue.
- Updated PC BIOS
I have tested connecting the printer to the router with a network cable and then installing printer as a networked device rather than USB and then the hpscan.exe works. So this is only an issue with USB (though it wouldnt be practical to try and talk 200+ users through networking their printer).
As you can see, we have tried almost everything. Interestingly we havent been able to replicate this issue in one of our main offices - despite collecting the same PC and Printer from an estate and bringing it back to an office.
We have also sent out a working PC and Printer combo to an affected estate office and it has not worked there.
Our Estate Offices connected via an ADSL Router and "My Documents" are re-directed to a network location. Could a failure in accessing this network location cause the problems? I have tested connectivity to network store from PC and it accesses the files fine.
Any solutions would be greatly received, I have spoken to HP After Sales support but not received an working solution yet.

Greetings, @Scammell29
I have read through your post and have very ideas left for you, as you've tried quite the load of troubleshooting!
I am thinking the issue could be power related, so try a power reset and plug the printer in directly to the wall outlet. Avoid power bars, surge protectors, etc. Just a direct plug in to the wall to test the power. Afterwards, see if you still receive the communication error.
If the issue continues, next try a disk cleanup, the instructions are included in this guide: A 'No Computer Detected' or 'Connection Error' Message Displays during Scanning for HP Officejet 650...
If the error still persists, perform a Clean Boot and restart the PC and then disable the Firewall and Anti-Virus scanners.
Please let me know the results!
Good luck
R a i n b o w 7000I work on behalf of HP
Click the “Kudos Thumbs Up" at the bottom of this post to say
“Thanks” for helping!
Click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution!

Serial communication does not work in an executable.

I have created a vi that communicates with a serial device. It works fine on the computer that it was creatd on. I then created an application and then built an installer to put it on another machine. The second machine does not have LV 2009 on it. Once installed on the machine the vi does not work. When it runs on the computer with LV 2009 the the com port control is a pull down, and it lists all comports on the computer and then you select the one you want to connect with. The computer that the vi is installed on does not list the available com ports. This leads me to believe that there is no serial comms support in the installable version. What do I do now?? I noticed that you can add "Additional Installers" when you build the installer and one of them is NI-Serial 3.4. I try to add this and a message said that it had to get, so I didn't use it thinking it was more than I needed and that standard com port driver would be included. Am I wrong here or am I missing something else?? All help is greatly appreciated.
[email protected]
Solved!
Go to Solution.

claudio.rossi wrote:
Hi at all!!
I'm new in NI forum.
I have one similar problem. My VI communicate with external device on serial port. The VI work very well, but when I create executable (.exe) file with Labview application builder (on Labview 2010) the .exe don't use serial port!!! The executable run perfectly (nothing error or warning by the application builder), but the serial data on selected COM port isn't send!!! Also on the PC where I developed the VI!!!
What do you mean by your last sentence? Are you trying to say that you can't run your executable even on the same computer on which you developed the application? If so, was LabVIEW open when you tried to run it? Try quitting LabVIEW; if you had previously run your VI and didn't close the serial port, LabVIEW might have kept it open, which would prevent the executable from accessing it. If the executable won't run on the development machine it's unlikely to be resolved by installing VISA since you need that installed for the VI to work properly in the development environment. Do you have any error handling in your code that would indicate if an error occurred after trying to write to the serial port (an indicator on the front panel, or a call to Simple Error Handler)?

MAX communication hangs after Standby Mode(with GPIB PCMCIA)

I have a IBM Laptop with MAX 2.2 and a GPIB PCMCIA Card installed. After booting the computer I can communicate with GPIB instruments without problems. After I get the Laptop out of a Standby Mode, MAX can not make any connection to GPIB devices; when I scan for Instruments it hangs as well.
The troubleshooting wizard tells me: one or more GPIB interfaces failed.
Does anyone have the same problems or solutions ?

On the NI-488.2 2.0 download page it is mentioned that that driver does not support standby mode. No such mention is made on the download page for NI-488.2 version 1.7 (which I need to use for my PCMCIA-GPIB interface), although the 1.7 release shows very much the same problem: After stand-by, communication with the GPIB port is no longer possible.
The Visual Basic example tool for preventing stand-by may help those users who are familiar with VB, but it does not help me.
Frankly - what I'd like to see is an improved NI-488.2 version that does support stand-by. Does NI consider providing such an upgrade/patch?

Usb communication

Hello,
I wonder if it is possible to communicate with a microcontroller and a computer using usb. De controller had the usb function on board. I just wonder if it is posible with labview to show the data transmitted over the usb port.
Can someone tell something about it?
Tnx for helping me

VISA manual
Instrument control Tutorial
Instrument Control with the USB Hardware Bus
You could have found this info by searching the NI website.
Regards,
André
Using whatever version of LV the customer requires. (LV5.1-LV2012) (www.carya.nl)

Serial Communication problem in LabVIEW 7.0

I recently upgraded my test computer from a 450 Mhz machine to a
Del 2.8 Ghz Pentium 4processor with 512meg's of ram using Windows 2000 for the operating system running LabVIEW 7.0.
I use the serial port to communicate with a piece of hardware,
Rs232, 115200 baud, 8 bits, 2 stop bits. NO hardware or software handshaking
The hardware is capable of receiving data from the computer at a full 115200 baud up to 65k transfers at a time with no extra delays.
The problem that the serial data coming from the new Dell computer will send out 2 bytes then waits 2 to 3 milliseconds and sends 2 more bytes.
I generated a separate serial VI that will jest shove data out the serial port.
The VI is a VISA configure serial po
rt, into a while loop that contains 6 VISA Write VI
And on the backside of the wile loop a VISA close.
The above VI will generate the serial data stream as stated above
EXCEPT when I put a PROBE on each of the ERROR OUT of the 6 writes, then the serial port will generate a continuous serial data stream with no millisecond breaks.
I have changed the FIFO Buffer settings (all the possible combinations) of the serial port in Windows 2000, and that has hade no effect.
Any help would be greatly appreciated
James Zumstein
E-mail [email protected]
Attachments:
Serial_Test_1.vi ‏45 KB

Greetings!
Serial port commucations problems can be a real joy, can't they? Have you tried communicating with your instrument with Hyperterm? Usually Hyperterm is capable of operating with almost no overhead, so you can see if there's any strange symbols being transmitted that might be holding things up. There might be an extra CR being inserted, or something like that, which will show up as heiroglyphics in Hyperterm. See if all your symbols coming back are valid. This is where I usually start.
Hope this helps.
Eric
Eric P. Nichols
P.O. Box 56235
North Pole, AK 99705

A-B DH-485 communicat​ion port

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A-B DH-485 communication port