Servo settings represent timing pulse widths ranging from 1ms to 2ms. 0 corresponds to a 1ms pulse, 100 corresponds to a 2ms pulse, and 50 is midrange with a 1.5ms pulse.
The method sends 'sab' SRV-1 command (see SRV-1 Control Protocol), which controls 2nd bank of servos using 6th and 7th timers.