Maxx GW4102

The device

The programmable maxx GW4102 mobile communication gateway for industrial applications collects and processes the information from your devices, machines and sensors, and transmits it via the expanded LTE network. The PLC I/O interface expansion enhances the basic unit with 16 isolated digital inputs and four isolated digital outputs. The inputs are divided into four groups of four inputs with a common negative terminal for each group.

This constellation allows the connection of up to four devices (e.g. PLCs) with minimal wiring effort while keeping each device isolated from each other.

The maxx GW4102 gateway is therefore ideal for transmitting measurements from the field to the head office or the cloud.

Interfaces

The following section describes the various interfaces of the GW4102 in detail. This graphic shows the distribution of the interfaces:

Pinout isolated outputs

Description	Function	Label	Signal	Pin	Pin	Signal	Label	Function
#isolated outputs	OUT 1	1A	ISO_OUT_A1	1	2	ISO_OUT_A2	2A	OUT 2
		1B	ISO_OUT_B1	3	4	ISO_OUT_B2	2B
			ISO_OUT_B1	5	6	ISO_OUT_B2
	OUT 3	3A	ISO_OUT_A3	7	8	ISO_OUT_A4	4A	OUT 4
		3B	ISO_OUT_B3	9	10	ISO_OUT_B4	4B

Pinout isolated inputs group A

Description	Function	Label	Signal	Pin	Pin	Signal	Label	Function
#isolated inputs group A	IN A1	A1	ISO_IN_A_P1	1	2	ISO_IN_A_P2	A2	IN A2
	IN A3	A3	ISO_IN_A_P3	3	4	ISO_IN_A_P4	A4	IN A4
	GND B	B-	ISO_IN_B_N	5	6	ISO_IN_A_N	A-	GND A

Pinout isolated inputs group B

Description	Function	Label	Signal	Pin	Pin	Signal	Label	Function
#isolated inputs group B	IN B1	B1	ISO_IN_B_P1	1	2	ISO_IN_B_P2	B2	IN B2
	IN B3	B3	ISO_IN_B_P3	3	4	ISO_IN_B_P4	B4	IN B4
	GND C	C-	ISO_IN_C_N	5	6	ISO_IN_B_N	B-	GND B

Pinout isolated inputs group C

Description	Function	Label	Signal	Pin	Pin	Signal	Label	Function
#isolated inputs group C	IN C1	C1	ISO_IN_C_P1	1	2	ISO_IN_C_P2	C2	IN C2
	IN C3	C3	ISO_IN_C_P3	3	4	ISO_IN_C_P4	C4	IN C4
	GND D	D-	ISO_IN_D_N	5	6	ISO_IN_C_N	C-	GND C

Pinout isolated inputs group D

Description	Function	Label	Signal	Pin	Pin	Signal	Label	Function
#isolated inputs group D	IN D1	D1	ISO_IN_D_P1	1	2	ISO_IN_D_P2	D2	IN D2
	IN D3	D3	ISO_IN_D_P3	3	4	ISO_IN_D_P4	D4	IN D4
			NC	5	6	ISO_IN_D_N	D-	GND D

isolated inputs

The following picture shows the simplified architecture one of the four isolated inputs with internal current limit and temperature stabilized threshold. Internally the isolation is achieved by the use of a TLP293 optocoupler.

Cascading inputs

Each group of four inputs features a common negative terminal to reduce wiring effort. Furthermore the groups can be cascaded as shown in the following diagrams. Other configurations following the same method are possible.

4x4 configuration

2x8 configuration

1x16 configuration

isolated outputs

The device contains two Panasonic AQW282 solid state relais to realize four independent isolated outputs. As there is no internal current limitation the user is responsible for ensuring a current flow of max. 300mA.

Cascading outputs

4x1 configuration

2x2 configuration

3+1 configuration

Linux mapping

Digital and analog I/Os (deprecated sysfs mapping)

Signal	Linux mapping	Function
ISO_IN_A1	/sys/class/gpio175	isolated digital inputs
ISO_IN_A2	/sys/class/gpio178
ISO_IN_A3	/sys/class/gpio174
ISO_IN_A4	/sys/class/gpio173
ISO_IN_B1	/sys/class/gpio177
ISO_IN_B2	/sys/class/gpio176
ISO_IN_B3	/sys/class/gpio172
ISO_IN_B4	/sys/class/gpio197
ISO_IN_C1	/sys/class/gpio203
ISO_IN_C2	/sys/class/gpio194
ISO_IN_C3	/sys/class/gpio198
ISO_IN_C4	/sys/class/gpio205
ISO_IN_D1	/sys/class/gpio67
ISO_IN_D2	/sys/class/gpio202
ISO_IN_D3	/sys/class/gpio65
ISO_IN_D4	/sys/class/gpio66
ISO_OUT1	/sys/class/gpio182	isolated digital outputs
ISO_OUT2	/sys/class/gpio180
ISO_OUT3	/sys/class/gpio179
ISO_OUT4	/sys/class/gpio181

Digital and analog I/Os (new libgpiod mapping)

Signal	Linux mapping	line	Function
ISO_IN_A1	gpiochips5	line 15	isolated digital inputs
ISO_IN_A2	gpiochip5	line 18
ISO_IN_A3	gpiochip5	line 14
ISO_IN_A4	gpiochip5	line 13
ISO_IN_B1	gpiochip5	line 17
ISO_IN_B2	gpiochip5	line 16
ISO_IN_B3	gpiochip5	line 12
ISO_IN_B4	gpiochip6	line 5
ISO_IN_C1	gpiochip6	line 11
ISO_IN_C2	gpiochip6	line 2
ISO_IN-C3	gpiochip6	line 6
ISO_IN_C4	gpiochip6	line 13
ISO_IN_D1	gpiochip2	line 3
ISO_IN_D2	gpiochip6	line 10
ISO_IN_D3	gpiochip2	line 1
ISO_IN_D4	gpiochip2	line 2
ISO_OUT1	gpiochip5	line 22	isolated digital outputs
ISO_OUT2	gpiochip5	line 20
ISO_OUT2	gpiochip5	line 19
ISO_OUT3	gpiochip5	line 21