User's Manual Part 6
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The following table describes the electrical specification of T2000-80 interface signals
available at the 15 way high density D-type connector (S21), mounted on the heatsink at
the rear of the radio.
The following diagram shows the pin designations of S21, viewed from the rear of the
radio.
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S21
Pin No.
Signal Description
1 OPTO-IN Input for external opto coupled line current detector.
+8V logic.
2 OPTO-OUT Output to drive external opto coupled line current switch.
1k ohm series resistor for LED.
3 +8V-OUT +8V output to supply external opto coupled line current detector.
4 +13.8V-OUT Unswitched +13.8V output to provide an unisolated keying sup-
ply.
5 LINE-OUT Output audio path to transmission line or transformer.
6 KEYING Bi-directional key line for use with simple two wire linking
(optionally linked to OPTO-IN internally). +8V logic.
7 BCD0-OUT Inputs used for 4 channel remote switching
with the T2010. +5V logic.
8BCD1-OUT
9 Spare Decoupled uncommitted line.
10 GND Options ground. This is earth derived from the regulator section
of the T2000 main PCB. Used to avoid earth loop noise.
11 PTT-IN Keys transmitter and operates line control logic. Trunking PTT
selectable. +5V logic, sense selectable by links.
12 BUSY/GATE Busy or Rx gate output. Trunking busy link selectable. +5V logic,
sense selectable by links.
13 IN-LOCK-OUT Synthesiser lock detector output. +5V logic, sense selectable by
links.
14 TX/RX-OUT Tx regulator control output. Indicates whether the radio is in Tx
or Rx. +5V logic, sense selectable by links.
15 LINE-IN Input audio path to transmitter audio stages. Normally linked to
LINE-OUT for a bi-directional line but is able to be separated for
other applications using two transmission lines.
- CGND Provided via S21 D-range and cable screen if required for RF sus-
ceptibility.
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1115
PCB