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West Mountain Radio
Operating Manual
sensing by moving the CBA HR’s voltage sensing function from the large Powerpole (current) connectors, to
an isolated measurement circuit (via 3.5 mm plug) to minimize test-lead resistance voltage drop.
A second circuit within the 3.5 mm plug serves as the remote input for optional magnetic temperature probe
(requires Extended Software license).
Note - Since the CBA HR automatically switches its battery test voltage measurement from Powerpole to 3.5
mm connector whenever a 3.5 mm plug is inserted into the auxiliary input, the use of an optional temperature
probe
ALSO
requires the use of remote voltage sensing wire lead harness.
Serial Port
Interconnection
The CBA has a 5 pin accessory port where PIN1 closest to the LEDs.
The CBA HR does not have a serial port. Sections covering RS-232 signal pin-outs and AT Command
programming language do not apply to CBA HR.
In order to use this accessory port with a serial interface, disconnect the USB and power the CBA through the
accessory port. 5V power should be able to source at least 200 mA. The serial interface is 3.3V TTL and 5V
tolerant. The Baud Rate is 2400.
PIN1 GND
PIN2 Reserved
PIN3 POWER
PIN4 Tx
PIN5 Rx
NOTE – CBA pins 1 & 2 are used for optional Temperature Probe input. Review that section for
additional details on temperature sensor connections.
The following is a schematic to convert computers RS-232 signal to communicate with the CBA.
