Sending one byte with Rs232 ?
Hello,
I have a device, which works with 1-byte commands.
example:
0xD1 has to be sent, where the high nibble (D) is one of six commands and the low nibble (1) is one of 15 possible addresses.
Commands are: E,C,D,8,5,4
Addresses are: 1-F
There are 90 possible combinations of commands and addresses.
I made a program, where i can choose the command and the address separately, and they will be combined individually in one string, which should be one byte.
Now the problem:
If i send this string via RS232 to a PC-Terminal, i see exakt the same string as in my program.
>> 0x51 should be the combined string and I want to see a "Q" at the terminal but the result is "51".
There are sent two bytes (0x35 and 0x31 for "51") than one 0x51 "Q".
When I make a Stringelement (with property "HEX-Display") and typing in the number (51) directly, i get a "Q" on the terminal.
How can i automate this?
I really spent a lot of time on this problem!
I hope you don't mind, but I took the liberty of modifying the block diagram to make it much more readable, and I got rid of the local variable which is unnecessary. Compare this block diagram to the one using the sequence structures. In this diagram, all of the code is visible at one time. The data flow insures that the funtions will operate in the correct order. This is the preferred method of coding over using sequence structures.
- tbob
Inventor of the WORM Global
Attachments:
RS232testprogi.vi 38 KB
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MaxMessageSize : 50 MB (52,428,800 bytes)
MaxMessageSize : 50 MB (52,428,800 bytes)
MaxMessageSize : 50 MB (52,428,800 bytes)
MaxMessageSize : 50 MB (52,428,800 bytes)
MaxMessageSize : 50 MB (52,428,800 bytes)
MaxMessageSize : 50 MB (52,428,800 bytes)
MaxMessageSize : 50 MB (52,428,800 bytes)
MaxMessageSize : 50 MB (52,428,800 bytes)
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InternalDsnMaxMessageAttachSize : 50 MB (52,428,800 bytes)
[PS] C:\Windows\system32>
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MaxSendSize : 60 MB (62,914,560 bytes)
[PS] C:\Windows\system32>
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Thanks!Hi!
Thank you very much for your help, I appreciate it a lot.
While I test my server, I execute ping www.myclienthost.com -t (my client games are in other office, in the same building, but different ISP) and I don't see anything strange, so I guess network is working perfectly. However, if I use wireshark (sniffer) and I see that my system fails (server does not send acks so client disconnects) is because my acks messages are not sended for 6 o 7 seconds (it should send them every 2 or 3). It seems thread is blocked. and after 6 or 7 seconds one message with 2 or 3 acks together is sent. So, I see that the thread handler blocked for a few seconds and this is doing my server is failing. Why client handler thread on my server is blocked? One question: every 2 or 3 seconds I have a thread that uses sleep that iterates thru client handlers and takes OutputStream and send one ack message for every client handler. My question is, in client handler class I have a method called SendInfo(String whatever) which encrypts and sends through OutputStream, should I protectd this method from accesing from two threads??? as acks thread and client thread can access at the same time. Could this be the problem??
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Edited by: Ricardo_Ruiz_Lopez on Jan 22, 2009 7:38 AM -
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Well I wouldn't call my customer an idiot either. I didn't know he was your customer. Sorry. Not every comment posted here is intended to directly solve a problem. We are a fun loving group, and occasional ribbings take place here. I still think that trying to use 9 bits over an 8-bit protocol is not a good way to go. But if it is the only way, then so be it.
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Does the Mark or Space parity bit add another 10th bit to the command or can i only use either ODD parity/Mark/Space?
According to the link you attached, the parity bit adds only one more bit. If the number of bits is set to 8, then the parity is the 9th bit, and you can only use Mark or Space to force that 9th bit to either 1 or 0 respectively. If you try to use odd or even parity, the protocol will determine the parity and change the bit accordingly, and it may not be the one you intended to send. The start and stop bits are fixed by the protocol and cannot be used for extra data bits.
Actually, until I read that article about using Mark and Space, I had no idea at all that sending 9 bits at a time was possible.
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