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| Problem connecting to 34401A using RS-232 |
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| NaxFM:
Hi everyone, I've been trying for hours but I can't connect to my multimeter using the RS-232 interface. I checked everything: the protocol settings, the settings on the multimeter, the null-modem cable, downloaded agilent utilities for connecting to dmms, used two PCs, verified with an oscilloscope that the signal is present, correct, and has correct voltage levels. Nothing, the multimeter doesn't respond to anything. I'm using putty to send serial command and recieve no response when sending SYSTem:REMote command or *IDN? command. Did I miss something? I'm really starting to think that there's a problem with the rs-232 interface in the multimeter... Do you have any idea? Edit: I had an "Eureka" moment and said "Of course! I didn't send the newline character!". Well, even with the newline character it doesn't work... I really don't want to spend 100+ euro for a GPIB cable... |
| nightfire:
Hmm... using putty, I also had in systems with multiple COM-ports chosen the wrong one, or some other utility blocking the port. Question: Do you see what you type, resp. is local echo=on? |
| PA0PBZ:
Set the flow control to none, remove the connector from the meter and connect pins 2 and 3 together. Do you see the echo on the screen when you type something? If not, there is something wrong at the computer side or the cable. If you see the echo and it disappears when you remove the short between pins 2 and 3 then the pc/cable side seems fine. Are you sure that pins 2 and 3 are not reversed on the meter side? |
| iMo:
When your dmm is set up to the rs-232 ("RS-232" shows up shortly during power-on on the display), you can see the measurement data coming out from the meter continuously on the single rs-232 connector pin - in form of an ascii string (as the first step in your debugging). Double check the speed setting as well. |
| alm:
Another thing to try is different kinds of line termination characters: LF, CR, CR+LF. Can you check the RS-232 signals with a scope to see if the 34401A is sending anything? |
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