Guralp Systems Limited
MAN-MIN-0001 - Güralp Minimus - Technical Manual
Section Index: 10.1 Ethernet 10.2 Power 10.3 GNSS/serial 10.4 Digital 10.5 Analogue 1 and Analogue 2

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).