Guralp Systems Limited
MSH-NAM-0004 - Using a NAM with GPS as a timing source - Application Note

Chapter 5. GPS adapter cable specification

5.1 J1 – GPS Receiver connection

This is a standard 10-pin “mil-spec” socket, conforming to MIL-DTL-26482 (formerly MIL-C-26482). A typical part-number is 02E-12-10S although the initial “02E” varies with manufacturer.

Suitable mating connectors have part-numbers like ***-12-10P and are available from Amphenol, ITT Cannon and others

Pin

Function

A

Power supply 0 V

B

Power supply +24 V

C

1 pulse-per-second (PPS) signal from GPS

D

not connected

E

not connected

F

not connected

G

RS232 ground

H

not connected

J

RS232 TxD

K

RS232 RxD (NMEA data from GPS receiver)

Wiring details for the compatible plug, ***-12-10P, as seen from the cable end (i.e. when assembling).

5.2 J2 – Connection to NAM Port A or Port B

This is a standard DE9F (TIA-574) sub-miniature (D-sub) socket, conforming to DIN 41652 and MIL-DTL-24308. They are very widely available, as are suitable mating connectors.

Pin

Function

1

1 pulse-per-second (PPS) signal from GPS

2

RS232 RxD (NMEA data from GPS receiver)

3

RS232 TxD

4

Not connected

5

RS232 ground

6

Not connected

7

Not connected

8

Not connected

9

Not connected

Wiring details for the compatible plug, DE9M, as seen from the cable end (i.e. during assembly).

5.3 Integrated GPS power supply inlet

The integrated power supply unit accepts an AC input voltage of between 100 V and 240 V at 50 Hz or 60 Hz. The input supply should be capable of providing 1.7 A.

The power inlet is a standard C14 connector, conforming to IEC 60320-1. They are very widely available, as are suitable C13 mating connectors.

No pin-out details are given here. It is recommended that commercially-available power cables with moulded connectors are used.