Campbell Scientific PS150/CH150 12 V Charging Regulators - Manual (Page 22)

PS150/CH150 12 V Charging Regulators
7. A100 Null Modem Adapter
The A100 adapter has two 9-pin CS I/O ports with a null modem between
them. The ports are used to connect two 9-pin devices (e.g., modems or RF
radios) that would normally be connected to the CS I/O port of a Campbell
datalogger. The charger supplies 12 Vdc and 5 Vdc to the appropriate pins on
the connector for powering the connected devices. This functionality is
required in a station where a datalogger will not be present, such as a phone-to-
RF base station. The A100 cannot be used as a null modem between two RS-
232 devices.
FIGURE 7-1. Null modem connections
FIGURE 7-2. PS150 with A100 module using a COM220 and RF450
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