Campbell Scientific SC932A 9-Pin to 9-Pin RS-232 Interface - Manual (Page 5)

1
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).