I am using a T40H TriPLC and I have a problem regarding RS232 comms.
I have downloaded the VB RS232 comms device manager and can use commands like RI00*, RI01* and WO00FF and I get the expected response without any problems
?however when I send the same command string, say RI00*, via my serial device manager, I don?t get a response from the PLC ? nothing is sent back to the PC.
I?ve listened in to the comms via hyper terminal and I?m definitely sending the same command strings.
The only PLC response I can received with my serial device manager program is the Ctrl-E (0x05) echo.
Can anybody help please?