Function
20 Digital Output Not used
21 Digital Output Not used
22 GPS Rx- GPS Rx-
23 GPS Tx- GPS Tx-
24 1PPS Rx- 1PPS Rx-
25 0 V 0 V
Table 7: Facilities Connector Pin-outs.
Maximum current provided by the supply voltage pin (pin 13) is 1 A protected by a self
resetting fuse.
The Digital Outputs are open collector and able to sink 300 mA each; the total for all
outputs must not exceed 600 mA.
Digital inputs are active low. Digital high voltages should not exceed 20 V.
The GPS Rx and 1PPS Rx connections are Differential RS422.
The “Analogue Out” connection is between 0 V and 5 V and software controlled to
indicate various functions e.g. Received Signal Strength Indication (RSSI) level.
Doc Number: TNM-I-E-0046 ISSUE 1.2 Page 33
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