Thank you for the comments.
1. Cable was home-made but I checked the schematics described in the manual and two ends' connectivity using a elelctrical multimeter.
2. During my trials using Labview(VISA communication), I can't receive any error message.
For example, when I send a message which was expected to resonse from the instrument, OK(0) message was issued in error-out message even if the RS-232 cable was not connected to the instrument.
I think COM port can be a problem.
Therefore I would like to test the cable and the computer setting of COM1 port.
Could you please let me know how to check them effectively?
and describe the screen of hyperterminal?
(If connected, can I always see some HELLO messages from the instrument?)
(and should I press any special key to send a command?)
Thank you again and looking forward to seeing you again.
Message Edited by labmaster on 06-03-2005 02:03 PM