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LED
Color
Tx
Red
Blinking Amber
Off
RD/TD
Green
Red
1.4.3 USER INTERFACE PORT
The user interface port is an 8 pin block receptacle, programmable to work with 1.8V to 5V levels. The following table
shows pin-out descriptions for the User port.
Figure 2 User Interface Port Connector
Table 3 Pin-Out for User Connector
Contact
Signal Name
1
Tx Audio in OR RS-485/422 RxB/RxD+ (input)
2
Rx Audio Out OR RS-485/422 TxB/TxD+ (output)
3
PTT OR RS-485/422 RxA/RxD- (input)
4
RSSI Out OR RS-485/422 TxA/TxD- (output)
5
Ground
6
Configuration Select 1 (internally pulled high)
7
Configuration Select 3 (internally pulled high)
8
Configuration Select 2 (internally pulled high)
1
When RS-422 or RS-485 is configured.
2
For Half-Duplex (2 wire) connections, connect pin 1 (RxB/RxD+) to pin
2 (TxB/TxD+) and pin 3 (RxA/RxD-) to pin 4 (TxA/TxD-).
Guardian™ Serial Modem or Analog Radio for Licensed Spectrum PN 001-5006-000 Rev. 3
Definition
Transmitting data
The unit wants to transmit, but is inhibited
Receive data is being sent out of the port
Transmit data is being received by the port
1,2
1,2
1,2
1,2
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