I'm having problems communicating with a Thermotron AST-8800 Controller via RS-232 COM1 Port

[FrostytheSnowman]

Spoiler

I configure the RS-232 COM1 port in my laptop for 19200Baud, 8bits, NOparity, 1StopBit, NONE_flowcontrol, CR_termchar.

When I sent the IDEN? command (Thermotron's *IDN? version), I got Warning # 1073676294, "The number of bytes transferred is equal to the Input Count. More data might be available".   I then doubled the Write count and sent it in as the Read count.

The response I get is this: ýýýýýýýýýýýý.

I have tried a Null-Modem cable, with and without Termination Characters, and no luck.   Any ideas ?

[RavensFan]

Have you tried to use Hyperterminal to determine if it works that way?

[FrostytheSnowman]

Hi.  Not yet, but I have a window opening up this afternoon on a unit that I can try that on.   thanks.

[Doug-W]

In addition to what RavensFan suggested, I'd also suggest that you reference the Themotron product manual. If you see garbled characters in hyperterminal, this could indicate the baud rate is not configured properly. Please verify that the controller should be configured for 19200 8-N-1.

Doug W

[ZiadAlkhoury]

@FrostytheSnowman Have this helped ?