2-8 Accessory Connections
The new AT/RAT7000B tuners must use Accessory 3 with the follow-
ing pins:
Data Terminal Interface
The TW7000 can interface with its own line of computers (TW9200,
DT9400, and RT9300) or to other external units using Accessory 1
with the following connections:
4 ATUINIT (tune initiate)
5 ATUKEY\
16 ACHKTUNE (tuner check tune)
17 ADATA (tuner data)
18 ACLOCK (tuner clock)
19 ASTROBE (tuner strobe)
24 +12V ACC (1.8A peak)
Pin Number Description
14 Ground
15 Ground
19 ATURX(tunerRXdata)
20 ATURX(tunerRXdata)
24 +12V ACC
25 +12V ACC
Pin Number Description
1 Ground
2 COM1RXD (RS422/RS485)
4 COM1TXD (RS422/RS485)
6 BALRXA1 (balanced RX audio)
7 BALRXA2 (balanced RX audio)
8 BALTXA1 (balanced TX audio)
9 BALTXA2 (balanced TX audio)
10 AUXPTT\
14 EXTCWKEY (external CW key)
Pin Number Description
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