7EN02–0305–02

RS-232 connections

Use the appropriate diagram below to connect your meter’s RS-232 communications.

RS-232 cable connection options1

  1. Direct to computer: Plug the meter’s 24-pin Molex connector to the communications breakout cable. From the breakout cable, plug the DB9 connector to the computer’s serial port. If required, use a straight-through modem cable to extend the cable length.

  2. Direct to external modem: Plug the meter’s 24-pin Molex connector to the communications breakout cable. From the breakout cable, plug the DB9 connector to a null modem cable. Plug the other end of this cable to the external modem.

  3. I/O Expander to computer: Plug the meter’s 24-pin Molex connector to I/O Expander. Use a null modem cable to connect the I/O Expander’s DB9 connector to the computer’s serial port.

  4. I/O Expander to external modem: Plug the meter’s 24-pin Molex connector to I/O Expander. Use a straight-through modem cable to connect the I/O Expander’s DB9 connector to the external modem.

1 This only applies to meters with breakout cable option. For meters with breakout panel option, use the serial communications connectors on the meter’s rear panel.

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