HP 34401A User Manual page 152

Chapter 4 Remote Interface Reference
RS-232 Interface Configuration
The multimeter holds the
A form of interface deadlock exists until the controller asserts the
line to allow the multimeter to complete the transmission.
TRUE
You can break the interface deadlock by sending the <Ctrl-C> character,
which clears the operation in progress and discards pending output
(this is equivalent to the
character to be recognized reliably by the multimeter while it holds DTR
FALSE, the controller must first set DSR FALSE.
In addition, you may have difficulty sending the <Ctrl-C> character if
you are interrupting a query operation, in which case the multimeter
hold the line
DTR FALSE
anything unless you first reprogram the interface to ignore
RS-232 Troubleshooting
Here are a few things to check if you are having problems communicating
over the -232 interface. If you need additional help, refer to the
RS
documentation that came with your computer.
Verify that the multimeter and your computer are configured for the
same baud rate, parity, and number of data bits. Make sure that your
computer is set up for 1 start bit and 2 stop bits (these values are fixed
on the multimeter).
Make sure to execute the SYSTem:REMote command to place the
multimeter in the
REMOTE
Verify that you have connected the correct interface cable and adapters.
Even if the cable has the proper connectors for your system, the
internal wiring may not be correct. The HP 34398A Cable Kit can be
used to connect the multimeter to most computers or terminals.
Verify that you have connected the interface cable to the correct
serial port on your computer (
152
line while output is suspended.
DTR FALSE
-488 device clear action). For the <Ctrl-C>
IEEE
. This may prevent the controller from sending
mode.
1, 2, etc).
COM COM
DSR
.
DTR