Serial Communication with TDK-Lambda

[mraya001]

Hello, I'm trying to control the genesys TDK-Lambda 750W power supply through serial communication(Through hyperterminal). I have connected my power supply with the PC using a RS 232 cable with DB25 and Rj-45 connectors. THe power supplu has the following settings:

Bits per second:9600(Default)

Parity :None

Address:06(Default)

For serial communication the power supply is setted to use RS232 in the rear panel.

I have verified the address, the baud-rate, the switches on the rear of the instrument, but it appears all ok.

I have verified the COM in the PC, too..but it doesn't talk with the tdk lambda. when I send "ADR 06" to the power source through hyperterminal it should say "OK", but I read only

ADR 06

ADR 06

I don't know whether the communication port on the power supply is enabled or not.could any please help. Thank you

[Dennis_Knutson]

Neither hyperterminal or the instrument are NI products so I'm not sure why you are posting here. The vendor should have a support page.

That being said, double check the command and the termination character(s).

[nyc_(is_out_of_here)]

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I don't know whether the communication port on the power supply is enabled or not.could any please help. Thank you

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You are the one sitting in front of the instrument. How are we to know?

[swrose]

Baud rate needs to be set to 19200.  

Have fun.

[JHebert]

mraya001, were you able to get this to work?  I have the same Lambda power supply with the Lambda-supplied RJ45 to DB9 RS-232 cable and I get no response from the power supply whatsoever, just a timeout.

The port on the supply is enabled as far, as I can tell from the documentation.  The PC's serial port is functioning because I can use the NI-MAX VISA Test Panel to communicate with two other devices that are presently sitting on my desk.

Unless I missed it, the documentation does not say anything about having to send special termination characters, but it wouldn't surprize me if that's what it is.

[JHebert]

Ok, I got this to work using the VISA Test Panel in NI-MAX.  It was the termination string which Dennis alluded to in a previous post. 

Make sure you uncheck Send End On Writes.  The power supply requires only a carriage return after a command.  Nothing more, nothing less.  Oddly, it will not work if you check Enable Termination Character.  Once I unchecked those and manually added the \r to the end of my command strings, everything worked.  Also note that the supply will not respond if it doesn't get a ADR\s06\r as the first command in a "session" (the \s and \r are just visual representatives of a space and a carriage return respectively.  06 is the factory default address setting).

(edited for spelling)