User Manual

SDB670 – SERVICE MANUAL TNM-M-E-0032

May 13 Page 28 DESCRIPTION

4.3.8 Facilities Connector

The 25-way D Type facilities connector can be programmed for any combination of digital inputs

and outputs.

The connector pin-outs for the 25-way D Type Facilities Connector are shown below in Table 14.

Table 14. Facilities Connector Pin-outs

Pin Function Pin Function

1 Digital Input 14 Digital Output

2 Digital Input 15 Digital Output

3 Digital Input 16 Digital Output

4 Digital Input 17 Digital Output

5 Digital Input 18 Digital Output

6 Digital Input 19 Digital Output

7 Digital Input 20 Digital Output

8 Digital Input 21 Digital Output

9 GPS Rx + 22 GPS Rx -

10 GPS Tx + 23 GPS Tx -

11 1PPS Rx + 24 1PPS Rx -

Digital to Analogue Convertor (DAC)

Output

0 V

13 Supply Voltage

The maximum current provided by the supply voltage pin is 1 A, which is protected by a self

resetting fuse.

Digital Outputs are open collector able to sink 300 mA each; the total for all outputs must not

exceed 600 mA. See Figure 8 overleaf.

Digital inputs are active low. Digital high voltages should not exceed 20 V. See Figure 8.

GPS Rx and 1PPS Rx are Differential RS422.

The “Analogue Out” signal is between 0 V and 5 V and software controlled to indicate various

functions e.g. RSSI.