Campbell Scientific SC932 9-Pin to RS-232-DCE Interface - Manual (Page 5)

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SC932 9-Pin to RS-232-DCE Interface
FIGURE 1. SC932 9-Pin to RS-232-DCE Interface
1. General Description
The SC932 (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 SC932 is supplied from the 5 V supply on pin 1 of the
datalogger’s I/O port. The SC932 will use the 5 V supply to power the
RS-232 modem if needed.
• Power usage is jumper configurable for certain hardware configurations.
• Jumper selectable for two way (interactive) communication, one way
(output or printer) communication, or both.
The SC932 is most 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 SC932 is also commonly used with the satellite transmitters and spread
spectrum radios.