CalAmp GUARDIAN User Manual download pdf (Page 12)

LED

Color

Definition

Red

Blinking Amber

Off

Transmitting data

The unit wants to transmit, but is inhibited

RD/TD

Green

Red

Receive data is being sent out of the port

Transmit data is being received by the port

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)

1,2

2 Rx Audio Out OR RS-485/422 TxB/TxD+ (output)

1,2

3 PTT OR RS-485/422 RxA/RxD- (input)

1,2

4 RSSI Out OR RS-485/422 TxA/TxD- (output)

1,2

5 Ground

6 Configuration Select 1 (internally pulled high)

7 Configuration Select 3 (internally pulled high)

8 Configuration Select 2 (internally pulled high)

When RS-422 or RS-485 is configured.

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 | Page 4

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CalAmp GUARDIAN User Manual Page 12