The function generator holds the DTR line FALSE while output is
suspended. A form of interface deadlock exists until the controller
asserts the
DSR line TRUE to allow the function generator to complete
the transmission. 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
IEEE-488 device clear action).
For the <Ctrl-C> character to be recognized reliably by the function
generator while it holds DTR FALSE, the controller must first set DSR
FALSE. When downloading binary data for an arbitrary waveform,
press the front-panel LOCAL key first and then send <Ctrl-C>.
RS-232 Troubleshooting
Here are a few things to check if you are having problems communicating
over the
RS-232 interface. If you need additional help, refer to the
documentation that came with your computer.
Verify that the function generator 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 function generator).
Make sure to execute the SYSTEM:REMOTE command to place the
function generator in the
REMOTE mode.
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 34398A Cable Kit can be used
to connect the function generator to most computers or terminals.
Verify that you have connected the interface cable to the correct
serial port on your computer (
COM1, COM2, etc).
4
Chapter 4 Remote Interface Reference
RS-232 Interface Configuration
199
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