User's Manual Part 6

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The following table describes the electrical specification of all CCI interface signals.
These signals are available at the 15 way high density D-type connector (S21) mounted
on the heatsink at the rear of the radio.
All signals necessary to provide CE and modem connection may be routed via these
pins. Some signals may be selected by links on the UART interface module for different
characteristics (refer to the circuit diagram and Section 8.12.4).
S21
Pin No.
Signal Description
1CTSB
Clear to send in B
Handshaking input for port B. This signal complies with the
electrical requirements of the RS-232 specification.
2DGND
Digital ground
Ground reference for all digital signals.
3TXDB
Transmit data out port B
Data output from serial port B. This signal complies with the
electrical requirements of the RS-232 specification.
4 +13.8V-SW
+13.8V supply out
Switched supply voltage. Can supply power to the AE when
the radio is switched on. Maximum current = 300mA.
5 RX-AUDIO
Receive audio out
This output is link selectable between one of the following sig-
nals:
1. DET-AF-OUT
(P13 pin 1)
Receiver detected audio:
unprocessed
receiver audio.
Output impedance = 600
Ω
.
Delivers 0 to 250mVrms (adjustable) into
600
Ω
at 1kHz (60% of full system deviation).
2. RX-GTD-AF
(P13 pin 7)
Receiver gated audio:
de-emphasised
receiver audio, gated by mute element.
Delivers 0 to 250mVrms (adjustable) into
600
Ω
at 1kHz (60% of full system deviation).
6RXDB
Receive data in port B
Data input to serial port B. This signal complies with the electri-
cal requirements of the RS-232 specification.
7RXDA
Receive data in port A
Data input to serial port A. This signal complies with the elec-
trical requirements of the RS-232 specification.
8TXDA
Transmit data out port A
Data output from serial port A. This signal complies with the
electrical requirements of the RS-232 specification.
9DTRB
Data terminal ready out B
Handshaking output for port B. This signal complies with the
electrical requirements of the RS-232 specification.
10 OPTIONS-GND
Options ground
Ground reference for all analogue signals.