Handsfree Accessories

Signal Specification, Handsfree Accessories

General
All the values given below are between the terminals stated in column 1 and terminal #1 in column 2 (signal ground). This applies unless otherwise indicated in brackets.

NOTE: It is important to connect the breakout box and check the ground terminals before taking readings.

U = DC voltage in volts (V)
UAC = AC voltage in volts (V)
Ubat = Battery voltage (V)
f = Frequency in Hertz (Hz)
Ulow = Voltage approximately 0 V
t = Time in seconds
PWM = Pulse width modulated signal as a %