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SC932A 9-Pin to RS-232-DCE Interface

Datalogger

DCEDevice

SN:

SC932A

MadeinUSA

CAMPBELL

SCIENTIFIC,INC.

Logan,Utah

FIGURE 1. SC932A 9-Pin to RS-232-DCE Interface

1. General Description

The SC932A (Figure 1) is used to interface a CSI datalogger to any modem that

is configured with an RS-232 DCE (Data Communications Equipment) serial

port. Features include:

• True RS-232 signal levels.

• Power for the SC932A is supplied from the 5 V supply on pin 1 of the

datalogger’s I/O port. The SC932A will use the 5 V supply to power the

RS-232 modem if needed.

• Two way (interactive) communication.

The SC932A is frequently used with a short haul modem to communicate

across a dedicated line made of 2 pairs of twisted wire with a shield. Section 3

describes the details of this application using a short haul modem built by RAD.

The SC932A is also commonly used with the satellite transmitters, cellular

modems, and spread spectrum radios.

The SC932A does not support one way output or printer communication. Data

transfer is blocked when pin 6 from the datalogger is high (SDE/printer enable).

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Campbell SC932A Manual do Utilizador Página 5