User guide

1
SC105 9-Pin to RS-232-DCE Interface
Figure 1. SC105 9-Pin to RS-232-DCE Interface
1. General Description
The SC105 (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.
The SC105 is an intelligent interface that buffers data (1k 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 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
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.