User guide

Appendix G: Specifications 49
Serial Interface
Max Baud Rate Supported
19.2K Baud
Serial Data Format
Transparent
Signals Transferred
TX, RX, RTS, CTS, DTR, DSR
Local Unit Connector
DB9 female (DCE)
Remote Unit Connector
DB9 male (DTE)
Audio Interface
Description
Bi-directional stereo audio link
Transmission method
Digitized virtually CD quality audio (16-bit, 38.4kHz)
Signal levels
Line level (4 Volts Pk-Pk maximum)
Input Impedance
47kΩ
Local Unit Connectors
2x3.5mm stereo jack socket (Line In & Line Out)
Remote Unit connectors
2x3.5mm stereo jack socket (Line/Mic In & Line Out)
Microphone Support
Microphone may be connected to Remote Unit
Pullup resistor provides bias for condenser
microphone
Option to set microphone amplification to +17dB
Power Requirements
Local Unit
5V at up to 250mA supplied by CPU.
Connector for optional 5V PSU.
2.1mm DC Jack, center positive.
Overvoltage protection: unit switches off if a PSU
>6.0V is connected.
Remote Unit
9V DC, 1A (max)
0V output must be isolated from power ground.
2.5mm DC jack, center positive.
Unit switches off if a non-isolated PSU connected.
Remote Unit Power Supply
9V DC, 2A (18W), Regulated
(certified to all relevant safety standards)
Universal IEC Input
Isolated Output
2.5mm DC jack, center positive.