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 (tuner RX data)
20
ATURX (tuner RX data)
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