sagcree

innoaloe, Thank you for the information. I did some more work with the cabling and found out that in addition to jumping RTS and CTS on the HMI I also need to jumper DTR and DSR in the HMI. When I did that it started working.

I have an Omron CQM1-CPU41-V1 and a NT30C HMI. I would like to replace the NT30C with a Proface GP4301-TM. The Proface HMI software (GP-Pro EX) has a Omron driver to communicate with the CQM1. I’ve followed the directions provided from Proface for setting up the communications in the CQM1 and the GP4301. I also create the special cable that needs to go from the RS232 ports on the CQM1 and the GP4301. I’m getting either a cable is disconnected or response timed out error from the GP4301. I’ve tried various communications settings to no avail. The last thing I’ve done is to run the RS232 cable from the NT30C into my PC and forward it out of my PC to the CQM1 using a piece of software call Termite. What this does for me is to see what is being sent on the RS232 line. The 1st code sent from the NT30C to the CQM1 is @00MM40 (in ASCII), the CQM1 responses and they both work fine together. When I connect up the GP4301 in this fashion the 1st code sent out from it is @00MS5E (in ASCII). As you can see these are different and the CQM1 does not response.   Does anyone have ideas on how to get the correct code out of the GP4301?   Thank You, Steve

Reloading my USB to RS232 adapter software solved the issue. Thanks for the reply.

Hi, We’ve just got a system in with a NT30C. I am trying to connect to it using NTST v4.85. I keep getting a time out error. I’ve tried connecting to my computers serial port and a USB RS232 adapter. The cable I’m using is self-built using the instructions found in the download section here. I have a serial port sniffer program. When I set to the communication settings as described in the NT30C manual (9600, 7 data bits, even parity, 2 stop bits) and when I go into the NT30C RS232 check, I get the correct bit pattern back for the NT30C. Which tells me that my cable is good. When I set the serial port sniffer program to sniffer mode and attempt to communicate with the NT30C via the NTST (by attempting an upload or set the time), the sniffer shows that when NTST opens the com port it changes the communication settings to 9600, 8 data bits, no parity, 1 stop bits. And I get a time out error. Even if I put the correct settings in the Windows Com Port Setting, NTST will still change it. Is there a way to change these settings in NTST . Thanks, Steve