VISA serial port communication – communication with device too slow

I am having some trouble with using VISA to communicate with a serial device. I am trying to control an advanced illumination line light. The attached program writes information to it just fine, nothing fancy there. However it seems that if I try to update any faster than about 300mS the line light controller will not properly receive the information and does not adjust the light. The device came with a simple program to control it which can update faster than 100mS. Any suggestions for faster updates?
Thanks,
Rob
Attachments:
line light control.vi ‏55 KB

Looks like this will be a rather useful program...
I ran the program and the results are in the attached files. 250mS.txt is of course running the LabVIEW application with a 250mS wait and 350mS.txt is using 350mS. As can be seen from the files everything returns a success each time, however the line light does not properly adjust its self when I use 250mS.
Attachments:
250mS.txt ‏7 KB
350mS.txt ‏5 KB

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Problems communicating with device over TCP/IP

Greetings,
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Hello CryoGuy,
Thanks for the question.
Your description seems to fit this KB about poor performance in TCP read. If this document isn't helpful, please let us know the following:
1. Which OS are you using?
2. Which version of LabVIEW are you using?
3. What's the specific error number and message you're getting?
4. At which function in LabVIEW are you seeing this error? (Turn on highlight execution to see where the error starts if the message doesn't say.)
Thanks,
Lisa
Applications Engineer
National Instruments

Serial port communication IRP_MJ_READ

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Cisco Router 2600 Serial Port communications

I am working on configuring communications Router to Router through serial port. I have seen some videos and read some documentations. My configuration is as follows:
R1 (DCE) -> f0/0 192.168.1.1/24 - s0/0 192.168.2.1/24 <-----> Router2 ->(DTE) S0/1 192.168.2.2/24 f0/0 192.168.3.1.
I have configured the routing tables at both routers. It works when I ping from router to router and router to hosts successfully. Nevertheless, I can ping from hosts to the default gateways, but I cannot ping from hosts to the serial ports (adjacency). In short I cannot communicate from Network1 to Network2. Please do I have to do any extra configuration.

Router 1 (KelliR)
KelliR#show ip interface brief
Interface IP-Address OK? Method Status Protocol
Ethernet0/0 192.168.1.1 YES manual up up
Serial0/0 192.168.3.1 YES manual up up
TokenRing0/0 unassigned YES unset administratively down down
Serial0/1 unassigned YES unset administratively down down
KelliR#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
C 192.168.1.0/24 is directly connected, Ethernet0/0
S 192.168.2.0/24 [1/0] via 192.168.3.2
C 192.168.3.0/24 is directly connected, Serial0/0
============================================
Router 2 (HelderR)
HelderR#
HelderR#show ip interface brief
Interface IP-Address OK? Method Status Protocol
Ethernet0/0 192.168.2.1 YES manual up up
Serial0/0 192.168.3.2 YES SLARP up up
TokenRing0/0 unassigned YES unset administratively down down
Serial0/1 unassigned YES unset administratively down down
HelderR#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
S 192.168.1.0/24 [1/0] via 192.168.3.1
C 192.168.2.0/24 is directly connected, Ethernet0/0
C 192.168.3.0/24 is directly connected, Serial0/0
============================================
Even with f0/0 and s0/0 configured with the addresses in any router, no host at its respective routers is able to ping the s0/0. Hosts are able to ping its ethernet ports.
See ping comand below:
From router KelliR
KelliR#ping 192.168.3.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.3.2, timeout is 2 seconds:
Success rate is 100 percent (5/5), round-trip min/avg/max = 32/33/36 ms
KelliR#ping 192.168.2.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.2.1, timeout is 2 seconds:
Success rate is 100 percent (5/5), round-trip min/avg/max = 32/34/36 ms
KelliR#ping 192.168.2.101
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.2.101, timeout is 2 seconds:
Success rate is 100 percent (5/5), round-trip min/avg/max = 32/33/36 ms
KelliR#
==================================================================================
From router HelderR
HelderR#ping 192.168.3.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.3.1, timeout is 2 seconds:
Success rate is 100 percent (5/5), round-trip min/avg/max = 32/33/36 ms
HelderR#ping 192.168.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.1, timeout is 2 seconds:
Success rate is 100 percent (5/5), round-trip min/avg/max = 32/32/32 ms
HelderR#ping 192.168.1.101
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.101, timeout is 2 seconds:
Success rate is 100 percent (5/5), round-trip min/avg/max = 32/34/36 ms
HelderR#
====================================================
From Host connected to KelliR
C:\>ping 192.168.1.1
Pinging 192.168.1.1 with 32 bytes of data:
Reply from 192.168.1.1: bytes=32 time=2ms TTL=255
Reply from 192.168.1.1: bytes=32 time=1ms TTL=255
Reply from 192.168.1.1: bytes=32 time=1ms TTL=255
Reply from 192.168.1.1: bytes=32 time=1ms TTL=255
Ping statistics for 192.168.1.1:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 1ms, Maximum = 2ms, Average = 1ms
C:\>ping 192.168.3.1
Pinging 192.168.3.1 with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 192.168.3.1:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss)
=====================================================
From Host connected to HelderR
C:\Users\Helder>ping 192.168.2.1
Pinging 192.168.2.1 with 32 bytes of data:
Reply from 192.168.2.1: bytes=32 time=3ms TTL=255
Reply from 192.168.2.1: bytes=32 time=1ms TTL=255
Reply from 192.168.2.1: bytes=32 time=1ms TTL=255
Reply from 192.168.2.1: bytes=32 time=1ms TTL=255
Ping statistics for 192.168.2.1:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 1ms, Maximum = 3ms, Average = 1ms
C:\Users\Helder>ping 192.168.3.2
Pinging 192.168.3.2 with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 192.168.3.2:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

Fieldpoint serial port communication?

Hi,
I am a researcher from School of Biotechnology, Dublin City University, Ireland. I have been using Labview programming (version 8.2) for bioprocess monitor and control. I am using Fieldpoint (FP2010) module for data acquistion and control. I've connected analog outputs from various controllers to appropriate channels and found data acquistion working fine using respective VI's. We have few instrument outputs which are need to be connected through serial interface on filedpoint's serial port. We are using a multiplexer (B & B electronics) for channeling all serial outputs (of instruments) to serial port of Filedpoint. VI's developed for all serial interface of multiplexer ports found working (data logging ok!) , when it is connected directly to COM1 port of PC. But when multiplexer serial interface is connected to serial port of Fieldpoint, the data values fails to log on the PC. Ethernet cable is used for interfacing filedpoint with PC. It seems the PC recognises COM1 port for serial interface but not serial port of Field point.
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Hi,
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Add the bold line to the file as shown below:
<?xml version="1.0"?>
<?CDF VERSION="1.1"?>
<SOFTPKG NAME="{E62A7BA2-8ED9-4C4A-AFA1-0DE33A188D61}" VERSION="4.4" TYPE="VISIBLE">
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Now enter ASRL1::INSTR into "Ressource Name" and "COM4" as Alias name for example. Now go to VISA Server /Security and add a * to allow access for every Host connected to your target.
Save your settings and change to MySystem/Software/NI-VISA 4.x and go to VISA Options at the right page. Go to Aliaes and choose "ADD Alias".Now enter visa://your remote IP address/ASRL1::INSTR into "Ressource Name" and "COM4" as Alias name for example. Save your settings.
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Problem on WinXP / Labview 6.1 with VISA (serial port)

There is a problem on WinXP / Labview 6.1 with VISA which i use to poll the state lines of the serial port. The only functions that i use are "VISA Open", "Find Resource", line state properties and "VISA close".
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Attachments:
advanced.JPG ‏31 KB

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I have an HP C309a printer/scanner/fax. I have recently reconfigured it to work wirelessly instead of via the USB cable, which it does. But if I try to go on to the HP Solution Centre/Settings/Printer Toobox to clean the printheads, it tells me that this cannot be done because "the computer cannot establish two-way communication with the device".
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RXTX Parallel port communication with Pin Printer

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Simple metrics from google should suffice the SUN team from understand the need/huge requirement for supporting Serial and parallel port programming in windows. Platforms would always change and the team at SUN should remain commited in supporting new platforms.

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"Agilent 33250A is a function generator. It responds to simple strings vis COM port, such as: "APPLQU", "OUTPUT ON", etc...
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Attachments:
Write2COM1.vi ‏22 KB
Serial_Communication.vi ‏40 KB

In order to append a line feed inside your string control, you have to first enable "\" codes. You do this by right clicking on the control. Without doing that, when you type \n into the control, it gets interpreted as the characters \ and n. To append the line feed on the diagram, connect your string control to the first input of a concatenate strings function and wire a Line Feed Constant to the second input. The Line Feed Constant is on the String palette. Wire the output of the concatenate function into either the serial or VISA write. I've attached a picture to show you what I mean.
Attachments:
Concatenate_Line_Feed.jpg ‏6 KB

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