Campbell Scientific PS100 Power Supply, CH100 Regulator, and A100 and A105 Adapters - Manual (Page 8)

PS100 and CH100 Power Supply and Charging Regulators
INT
EXT
BATT
CHG
OFF ON
CHG
CHG
+12
+12
Charging
Regulator IN
OUT 3 A
Thermal
Fuse
These look
identical
when
unplugged
FIGURE 2. Simplified Charging Circuit Schematic
4. A100 Null Modem Adapter
The A100 has two 9-pin CS I/O ports with a null modem between them. The
ports are used to connect two 9-pin devices that would normally be connected
to the CS I/O port on a Campbell datalogger. The charger supplies 12 volts
and 5 volts to the appropriate pins on the connector for powering the connected
devices.
This cannot be used as a null modem between two RS-
232 devices. CAUTION
4