Chapter 10. Appendix 3 – Connector pin-outs

10.1 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.

10.2 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.

Caution: We recommend fitting an in-line 3.5 A anti-surge fuse in the positive power lead to protect the external wiring of the installation.

10.3 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).

10.4 Digital

This is a standard 10-pin military-specification bayonet sockets, conforming to MIL‑DTL‑26482 (formerly MIL‑C‑26482).

Pin	Function
A	Ground
B	Power
C	RS422 serial transmit – positive
D	RS422 serial transmit – negative
E	RS422 serial receive – negative
F	not connected
G	not connected
H	not connected
I	not connected
J	RS422 serial receive – positive

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

10.5 Analogue 1 and Analogue 2

These are standard 26-pin male military-specification bayonet plugs, conforming to MIL‑DTL‑26482 (formerly MIL‑C‑26482).

Pin	Function	Pin	Function
A	Vertical Acceleration/Velocity – differential non‑inverting input	P	Calibration signal (all channels)
B	Vertical Acceleration/Velocity – differential inverting input	R	Calibration enable – vertical channel
C	N/S Acceleration/Velocity – differential non‑inverting input	S	Calibration enable – N/S channel
D	N/S Acceleration/Velocity – differential inverting input	T	Calibration enable – E/W channel
E	E/W Acceleration/Velocity – differential non‑inverting input	U	Centre
F	E/W Acceleration/Velocity – differential inverting input	V	Aux sensor input – differential non‑inverting (or single) input
G	Vertical mass positions	W	Unlock
H	not connected	X	Lock
J	N/S mass positions	Y	Logic – ground*
K	BUSY line	Z	Sensor RS232 transmit
L	E/W mass positions	a	Sensor RS232 receive
M	Auxiliary sensor input – differential inverting input	b	Power – ground*
N	Signal – ground*	c	Power – positive

* “Power – ground” and “Logic – ground” are connected together internally and also connected to the digitizer case.
	Wiring details for the compatible socket, ***‑16‑26S, as seen from the cable end (i.e. when assembling).