Instruction Manual, HD-3500 Series
APPENDIX D. Optional Diving Board 13
REV F, April 1, 2015
APPENDIX D. Optional Diving Board
Terminal Block Pins
Non-labeled gray pins are ground
GPI: General Purpose Input
GPO: General Purpose Output
Vn+/- : Test Voltage (Not Connect)
TALLLY OUT/IN
DIn+/- : RS232/RS422 Input
DOn+/- : RS232/RS422 Output
Use always DO- / DI– (negative) for
RS232 wiring
ICR/L OUT: Intercom Right/Left Outputs
ICR/L OUT: Intercom Right/Left Inputs
AESn+/-: AES Inputs in TX, Outs in RX
AnR/L +/-: Analog Audio Inputs in TX
Analog Audio Outputs in RX
*For RS485 applications connect
together DO and DI with a small 680
Ohm resistor as shown below.
