Power & Communication Interface

Overview

The M-Series Modem Power & Communication Interface consists of a single wet-mate bulkhead connector available to provide power and communicate via Ethernet at 10/100 Mbps, RS-232, and/or RS-422 full-duplex.

Electrical Connections

The figure below shows the electrical connections for the Power & Communication Interface. All signal directions are relative to the M-Series Modem.

Connector face view

This is the face view of the male connector as mated to M-Series. M-Series has a female connector, and the pinout will appear mirror-imaged on the modem unit.

Connector pinout, male pins, face view.

Power & Communication Interface Electrical Pinout

Pin Number	I/O	Pin Name	Notes
1	P	LED Power	+3.3 V out when unit is powered up
2	O	RS-422 TX+	RS-422 transmit positive
3	O	RS-422 TX-	RS-422 transmit negative
4	I	RS-422 RX+	RS-422 receive positive
5	I	RS-422 RX-	RS-422 receive negative
6	I	Power Switch	Short to GND to power down unit. Leave open for normal operation.
7	P	GND	Communication interfaces GND, electrically connected to pin 15
8	O	ENET_DP0_P	T568A: green & white T568B: orange & white
9	O	ENET_DP0_N	T568A: green T568B: orange
10	I	ENET_DP1_P	T568A: orange & white T568B: green & white
11	I	ENET_DP1_N	T568A: orange T568B: green
12	O	RS-232 TX	RS-232 transmit
13	I	RS-232 RX	RS-232 receive
14	I	1PPS Input	Used for 1PPS or general-purpose digital input. +1.8 V to +5 V logic level.
15	P	GND	Power input ground, electrically connected to pin 7
16	P	VIN	Charger input, LIC-77WH-00: 25.5 V

Connector Hardware Components

The M-Series Power & Communication Interface connector is a MacArtney SubConn Micro Circular 16-pin female aluminum (M2000) or titanium (M6000) bulkhead connector, P/N MCBH16FAS or MCBH16FTI, and female locking sleeve, P/N DLSA-F BLUE.

The Power & Communication Interface is connected using a MacArtney SubConn Micro Circular 16-pin male inline cable, P/N MCIL16M, and male locking sleeve, P/N DLSA-M BLUE. The M-Series comes with a power-down plug mounted, which keeps pins 6 and 7 shorted and the modem powered down. The install kit for M-Series also includes an inline cable adapter, Popoto PDI board, battery charger, and dummy plug for easy interfacing with the modem.

Mating Cable Notes

Connector handling

Connectors must be greased with MOLYKOTE 44 Medium before every mating.

• Disconnect by pulling straight out, not at an angle.
• Do not pull on the cable and avoid sharp bends at cable entry.
• Ensure that there are no angular loads on the bulkhead connector.
• SubConn connectors should not be exposed to extended periods of heat or direct sunlight. If a connector becomes very dry, soak it in fresh water before use.
• The locking sleeve must be hand-tightened only.
• If using RS-422, mating cables should use twisted-pair wiring for pins 2/3 and 4/5.
• If using Ethernet, mating cables should use twisted-pair wiring, ideally 100 ohm differential impedance, for pins 8/9 and 10/11.
• If using alternate vendors for cabling, the color code may differ. Refer to the connector pinout above for pin and signal locations, and verify with a digital multimeter before terminating.

Popoto SubConn Inline Cable Color Code

Pin Number	Wire Color
1	Red
2	Red/White
3	Black
4	Black/White
5	Yellow
6	Yellow/White
7	Blue
8	Blue/White
9	Orange
10	Orange/White
11	Brown
12	Brown/White
13	Grey
14	Grey/White
15	Green
16	Green/White

MacArtney SubConn Inline Cable Color Code

Pin Number	Wire Color
1	Black
2	White
3	Red
4	Green
5	Orange
6	Blue
7	White/Black
8	Red/Black
9	Green/Black
10	Orange/Black
11	Blue/Black
12	Black/White
13	Red/White
14	Green/White
15	Blue/White
16	Black/Red