CPI port power levels are controlled automatically by the CR6:
l Off: Not used.
l High power: Fully active.
l Low-power standby: Used whenever possible.
l Low-power bus: Sets bus and modules to low power.
When used with a Campbell Scientific RJ45-to-DB9 converter cable, the RS-232/CPI port can be
used as an RS-232 port. It defaults to 115200 bps (in autobaud mode), 8 data bits, no parity, and 1
stop bit. Use Device Configuration Utility or the SerialOpen() CRBasic instruction to change
these options.
Table 2-8: RS-232/CPI pinout
Pin Number Description
1 RS-232: Transmit (Tx)
2 RS-232: Receive (Rx)
3 100 Ω Res Ground
4 CPI: Data
5 CPI: Data
6 100 Ω Res Ground
7 RS-232 CTS CPI: Sync
8 RS-232 DTR CPI: Sync
9 Not Used
2.5 Programmable logic control
The data logger can control instruments and devices such as:
l Controlling cellular modem or GPS receiver to conserve power.
l Triggering a water sampler to collect a sample.
l Triggering a camera to take a picture.
l Activating an audio or visual alarm.
l Moving a head gate to regulate water flows in a canal system.
l Controlling pH dosing and aeration for water quality purposes.
l Controlling a gas analyzer to stop operation when temperature is too low.
l Controlling irrigation scheduling.
2. Wiring panel and terminal functions 16
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