Campbell Scientific SC105 9-pin to RS232 DCE Interface - Manual (Page 7)

SC105 CS I/O to RS-232 Interface
1. General Description
FIGURE 1-1. SC105 CS I/O to RS-232 Interface
The SC105 (FIGURE 1-1) is used to interface a Campbell Scientific datalogger
to any modem that is configured with an RS-232 DCE (Data Communications
Equipment) serial port. The SC105 is an intelligent interface that buffers data
(1 kB buffer size), allowing many RS-232 data rates, and all CS I/O port
modes.
Features include:
• True RS-232 signal levels.
• Power for the SC105 is supplied from the 5 V supply on pin 1 of the
datalogger’s CS I/O port. The SC105 will use the 5 V supply to power the
RS-232 modem if needed.
• Two way (interactive) communication.
• Supports most RS-232 baud rates.
• Supports all CS I/O port modes.
The SC105 is frequently used with a short haul modem to communicate across
a dedicated line made of two pairs of twisted wire with a shield. Section 3, Set-
up Menu, describes the details of this application using a short haul modem
built by RAD.
The SC105 is also commonly used with satellite transmitters, cellular modems,
and spread spectrum radios.
The SC105 also supports one-way output or printer communication.
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