Guralp Systems Limited
MAN-FOR-0002 - Güralp Fortimus - Technical Manual

Chapter 12. Appendix 3 – Connector pin-outs

12.1 Ethernet

This is an Amphenol RJField-series 8P8C connector. It consists of a standard ISO 8877 8P8C modular socket (often called RJ45) in a bayonet mounting compatible with MIL-DTL-26482 (formerly MIL-C-26482).

Pin

10BASE-T & 100BASE-TX

1000BASE-T

1

Transmit Data +

BI_DA+

2

Transmit Data -

BI_DA-

3

Receive Data +

BI_DB+

4

not connected

BI_DC+

5

not connected

BI_DC-

6

Receive Data -

BI_DB-

7

not connected

BI_DD+

8

not connected

BI_DD-

This connector accepts unmodified ISO 8877 8P8C modular connectors (often called RJ45 connectors or Ethernet “Cat 5/6” connectors).

When used in hostile environments, a standard Ethernet cable can have a mating environmental shield (Amphenol part number RJF6MN) fitted.

12.2 Power

This is a standard 4-pin military-specification bayonet plug, conforming to MIL-DTL-26482 (formerly MIL-C-26482).

Pin

Function

A

Ground

B

10-36 V DC input

C

not connected

D

not connected

Wiring details for the compatible socket as seen from the cable end (i.e. when assembling).

Caution: Observe the correct polarity when connecting the power supply. The red lead (from pin B) must be connected to the positive terminal, typically labelled ‘+’, and the black lead (from pin A) must be connected to the negative terminal, typically labelled ‘-’. An incorrect connection risks destroying the digitiser, the power supply and any connected instruments.

12.3 GNSS/serial

This is a 14-pin LEMO EEG.1K socket. Suitable mating connectors can be found in the LEMO FGG.1K.314 range.

  • To engage the mating connector, line up the red marks and push firmly home.

  • To disengage, hold the mating connector by the gnurled outer sleeve and pull steadily.

Pin

Function

1

Ground

2

not connected

3

Ground

4

Debug (serial) receive

5

Debug (serial) transmit

6

not connected

7

GNSS power

8

GNSS pulse-per-second signal – RS-422 positive

9

GNSS receive – RS-422 positive

10

GNSS transmit – RS-422 positive

11

GNSS transmit – RS-422 negative

12

not connected

13

GNSS pulse-per-second signal – RS-422 negative

14

GNSS receive – RS-422 negative

Wiring details for the compatible plug, FGG.1K.314.*, as seen from the cable end (i.e. when assembling).