CONNECTORS
CONNECTORS ON THE RFU
368 E
NVOY™ TRANSCEIVER REFERENCE MANUAL
15-way GPIO connector
The GPIO connector is on a flying lead located on the left side of the back panel. It is
used to interface to a variety of third-party products such as morse keys, GPS units etc.
Figure 79: Front view of the 15-way connector
Table 23: Pinouts of the 15-way connector
Pin no. Function Input/output Signal level
1RTS
(Audio 2 out)
Output RS232
2 RS232 Rx data Input RS232
3 RS232 Tx data Output RS232
4 Ground 0 V
5 Tx audio (10 kΩ balanced) Input 300 mV p–p ALC threshold
6 External alarm relay contact
(Audio 2 out)
(NO or NC depending on jumper
P402)
Contacts rated 50 V, 1 A
7 External alarm relay common, or
600 Ω balanced audio
Output Contacts rated 50 V, 1 A, or
600 Ω audio
8 A rail protected
(2 A maximum)
Output +13.6 V nominal
9CTS
(Audio 2 In)
Input RS232
10 PTT Input 5 V TTL logic active low
11 Morse Input 5 V TTL logic active low
12 Busy
(Mute out)
Output 5 V logic
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