Chapter 5 Remote Interface Reference

RS-232 Interface Configuration

If your computer has a 9-pin serial port with a male connector, use the cable included with the instrument (if you ordered the internal DMM). If you need an additional cable, order the F1047-80002cable which is part of the HP 34398A Cable Kit. This cable has a 9-pin female connector on each end.

The cable pin diagram is shown below (this is the pinout for the cable shipped with the HP 34970A). For proper operation, you must use an RS-232 cable with the same pinout as shown below.

RS-232 Cable

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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 instrument 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 1 stop bit (these values are fixed on the instrument).

∙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. You can use the HP 34398A Cable Kit to connect the instrument to most computers or terminals.

∙Verify that you have connected the interface cable to the correct serial port on your computer (COM1, COM2, etc.).

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