8571—Overview and specifications
NGT Transceiver System Technical Service Manual 329
Pinouts of the 15-way GPIO connector on the split-site interface controller
Figure 8: Front view of the 15-way GPIO connector on the split-site interface
controller
Table 6: Pinouts of the 15-way GPIO connector on the split-site interface
controller
Pin no. Function Input/output Signal level
1 RTS Output 0 to 5 V
2 RS232 Receive data Input RS232
3 RS232 Transmit data Output RS232
4 Ground 0 V
5 Tx audio (50 kΩ balanced) Input 300 mV p–p for ALC
threshold
6 External alarm relay Contacts rated 50 V, 1 A
7 External alarm relay Closed for alarm
8 A rail Output +13.6 V nominal
9 CTS Input RS232
10 PTT Input 5 V TTL logic active low
11 Morse Input 5 V TTL logic active low
12 Spare Input/output 5 V TTL logic
13 Spare Input/output 5 V TTL logic
14 System audio Output 1 V p–p (maximum load
1kΩ)
15 Tx audio (50 kΩ balanced) Input 300 mV p–p for ALC
threshold
NOTE
External alarm relay: internal link to select normally open or closed. This
can be configured to switch to ground or the A rail.
18
915
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