REXGEN AirPinout

REXGEN Air: pinouts, harnesses, LEDs and installation

Updated

Find every REXGEN Air pin, choose the right harness, read the status LEDs and install the logger with its SIM, antennas, grounding and termination.

Connectors and harnesses

REXGEN Air has one wiring connector: an automotive Molex Mini50 dual-row 24-way header at the back. Power, the CAN buses, LIN, the inputs, the optional relay driver and the optional USB lines all run through it. In a production installation, crimp the mating connector from the box into the vehicle loom. For bench and development work, use a harness.

REXGEN Air harnesses and accessories
Part number What it is Use it for
INF4204.15 Mini50 splitter: four 9-way D-Sub leads (CAN0 and power, CAN1, CAN2 with LIN, CAN3) and one 15-way D-Sub lead for the inputs, 150 mm Direct bench connection with standard CiA 9-way CAN cables
INF4216 Mini50 (female) to 25-way D-Sub (male), 250 mm Turning the logger into a development logger with a 25-way D-Sub
INF4203 25-way D-Sub (female) breakout to two 9-way D-Sub connectors With INF4216, two buses
INF4204.1 25-way D-Sub (female) breakout to five 9-way D-Sub connectors With INF4216, every bus

INF4203 and INF4204.1 are the REBEL multi-connect cables. On an INF4216 they carry the CAN buses, LIN, power and the analogue inputs to the expected pins. Pins 11 and 23 of the 25-way D-Sub differ: REXGEN Air puts Erase and relay out there, where a REBEL has digital I/O. Do not rely on the REBEL digital I/O leads with a REXGEN Air. For the lead pinouts, see REBEL breakout cables: INF4203 and INF4204.1 multi-connect pinouts.

The package list does not include the INF4204.15 splitter.

Molex Mini50 24-way connector

All the connector parts are made by Molex:

REXGEN Air connector, Molex Mini50 24-way MOLEX MINI50 24-WAY · MALE REXGEN Air connector, Molex Mini50 24-way Front view of the header on the device, as the Molex drawing. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 1Relay out 0 (option) 2Digital in 0 3Analogue GND 4Analogue in 1 5Clamp-15 10USB D+ (option) 9CAN3-L (option) 8CAN2-L (option) 7CAN1-L 6CAN0-L 11+4.5 V out 12Digital in 1 13Analogue in 0 14Erase 15LIN 16GND 17Power GND 24USB D− (option) 23USB +5 V (option) 22CAN3-H (option) 21CAN2-H (option) 20CAN1-H 19CAN0-H 18Supply +5 to +27 V Power Ground CAN 0 and CAN 1 pins Linked pins are a differential pair
Looking into the header on the logger.
REXGEN Air cable plug, Molex Mini50 24-way MOLEX MINI50 24-WAY · FEMALE REXGEN Air cable plug, Molex Mini50 24-way Front view of the cable plug, mirror image of the header. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 10USB D+ (option) 9CAN3-L (option) 8CAN2-L (option) 7CAN1-L 6CAN0-L 1Relay out 0 (option) 2Digital in 0 3Analogue GND 4Analogue in 1 5Clamp-15 24USB D− (option) 23USB +5 V (option) 22CAN3-H (option) 21CAN2-H (option) 20CAN1-H 19CAN0-H 18Supply +5 to +27 V 11+4.5 V out 12Digital in 1 13Analogue in 0 14Erase 15LIN 16GND 17Power GND Power Ground CAN 0 and CAN 1 pins Linked pins are a differential pair
Looking into the cable plug, which is the mirror image.
Molex Mini50 24-way pinout
Pin Signal Notes
1 Relay out 0 (RelayOut0) Optional relay driver
2 Digital input 0 (DigIn0)
3 Analogue ground (AnalogGnd)
4 Analogue input 1 (Adc1) ±10 V
5 Clamp-15 (ignition) input Labelled Wake-up / Clamp-15
6 CAN0-L
7 CAN1-L
8 CAN2-L 4-CAN models only
9 CAN3-L 4-CAN models only
10 USB D+ (usbDP_conn) Factory option. Ask when you order.
11 Instrumentation supply out (4.5Vout) 100 mA maximum. The specification gives 5 V.
12 Digital input 1 (DigIn1)
13 Analogue input 0 (Adc0) ±10 V
14 Erase (Erase#)
15 LIN
16 Ground (GND)
17 Power ground (PowerGND)
18 Supply, +5 V to +27 V
19 CAN0-H
20 CAN1-H
21 CAN2-H 4-CAN models only
22 CAN3-H 4-CAN models only
23 USB +5 V (usb5V) Factory option. Ask when you order.
24 USB D- (usbDM_conn) Factory option. Ask when you order.

USB through the Mini50 connector needs a hardware change. Ask for it when you order. Otherwise, the logger must go back to Influx Technology for the change.

INF4216 cable: 25-way D-sub

INF4216 cable: a Molex Mini50 plug on a short black cable ending in a male 25-way D-Sub connector
INF4216: 250 mm, 22 AWG, black, Mini50 plug to male 25-way D-Sub.
REXGEN Air INF4216 cable, 25-way D-sub D-SUB 25 · MALE REXGEN Air INF4216 cable, 25-way D-sub Front view of the male connector on the INF4216 cable. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 1NC 2NC 3CAN3-L (4-CAN model) 4Analogue in 1 5Wake-up / Clamp-15 6CAN1-L 7CAN0-L 13CAN2-L (4-CAN model) 12Digital in 0 11Erase 10+4.5 V instr. supply 9Supply +5 to +27 V 8NC 14NC 15LIN0 16CAN3-H (4-CAN model) 17Analogue in 0 18Analogue GND 19CAN1-H 25CAN2-H (4-CAN model) 24Digital in 1 23Relay out (option) 22Power GND 21GND 20CAN0-H Power Ground CAN 0 and CAN 1 pins Linked pins are a differential pair NC: not connected
INF4216 male 25-way D-Sub pinout
Pin Signal Notes
3 CAN3-L 4-CAN models only
4 Analogue input 1 -10 V to +10 V
5 Wake-up / Clamp-15 Wakes the logger from sleep
6 CAN1-L
7 CAN0-L
9 Supply, +5 V to +27 V
10 Instrumentation supply 100 mA maximum
11 Erase
12 Digital input 0 Up to 28 V
13 CAN2-L 4-CAN models only
15 LIN0
16 CAN3-H 4-CAN models only
17 Analogue input 0 -10 V to +10 V
18 Analogue ground
19 CAN1-H
20 CAN0-H
21 Ground
22 Power ground
23 Relay out Optional feature
24 Digital input 1 Up to 28 V
25 CAN2-H 4-CAN models only

Pins 1, 2, 8 and 14 are not connected.

INF4204.15 splitter

INF4204.15 splitter: a Molex Mini50 plug branching into four 9-way D-Sub leads labelled CAN0/PWR, CAN1, CAN2/LIN 0 and CAN3, and one 15-way D-Sub lead labelled DIG/ANALOG
Each lead carries a printed label. The 9-way leads are male and the 15-way lead is female.

The splitter is 150 mm long, with a 6.5 mm outer diameter and twisted pairs for the CAN connections. It has a female Molex Mini50 plug, four male 9-way D-Sub connectors and one female 15-way D-Sub. Three of the 9-way connectors have screws and one has studs. The 15-way D-Sub has screws. The 9-way leads follow the standard CiA pinout, so CAN cables and tools plug straight in.

INF4204.15: which Mini50 pins reach each lead REXGEN AIR · INF4204.15 SPLITTER INF4204.15: which Mini50 pins reach each lead Lead Mini50 Signal Lead Mini50 Signal CAN0/PWR 9-way D-sub, male 2 6 CAN0-L 3 16 Ground 5 17 Power ground 7 19 CAN0-H 9 18 Supply, +5 V to +27 V CAN1 9-way D-sub, male 2 7 CAN1-L 7 20 CAN1-H CAN2/LIN 0 9-way D-sub, male 1 15 LIN 2 8 CAN2-L 3 16 Ground 5 17 Power ground 7 21 CAN2-H CAN3 9-way D-sub, male 2 9 CAN3-L 7 22 CAN3-H DIG/ANALOG 15-way D-sub, female 2 11 4.5 V out 3 10 USB D+ (factory option) 4 23 USB +5 V (factory option) 5 24 USB D− (factory option) 6 3 Analogue ground 7 4 Analogue input 1 9 2 Digital input 0 10 12 Digital input 1 11 16 Ground 13 5 Wake-up / Clamp-15 14 13 Analogue input 0 Mini50 plug, female, to the REXGEN Air Not brought out on the splitter 1 Relay out 0 14 Erase Lead pins not listed are not connected. Mini50 pin numbers are matched to each lead by signal name in the two pinout tables. The CAN2 and CAN3 leads carry signals only on 4-CAN models. The splitter is 150 mm long.
INF4204.15 9-way D-Sub leads
Pin CAN0/PWR CAN1 CAN2/LIN 0 CAN3
1 NC NC LIN NC
2 CAN0-L CAN1-L CAN2-L CAN3-L
3 Ground NC Ground NC
4 NC NC NC NC
5 Power ground NC Power ground NC
6 NC NC NC NC
7 CAN0-H CAN1-H CAN2-H CAN3-H
8 NC NC NC NC
9 Supply, +5 V to +27 V NC NC NC

The CAN2 and CAN3 leads carry signals only on 4-CAN models. The CAN1 lead does not supply power to other devices.

INF4204.15 DIG/ANALOG 15-way D-Sub lead
Pin Signal
1 NC
2 Instrumentation supply out (4.5 V out)
3 USB D+ (factory option)
4 USB +5 V (factory option)
5 USB D- (factory option)
6 Analogue ground
7 Analogue input 1
8 NC
9 Digital input 0
10 Digital input 1
11 Ground
12 NC
13 Wake-up / Clamp-15
14 Analogue input 0
15 NC

Wiring the inputs

Analogue inputs

The two analogue inputs are bipolar and single-ended, with a ±10 V range. Reference them to analogue ground. Never apply more than ±28 V.

Digital inputs

The digital inputs read below 0.8 V as low and above 2.5 V as high. A switch, a transistor, a relay contact or a logic gate can drive them. Each circuit in the diagram uses a pull-up to the instrumentation supply and pulls the input to power ground.

Four ways to drive a digital input DIGITAL INPUT · WIRING Four ways to drive a digital input Switch Instrumentation supply Pull-up Input A closed switch pulls the input low. NPN transistor Instrumentation supply Pull-up Input Control The transistor turned on pulls the input low. Relay contact Instrumentation supply Pull-up Input Relay coil in a separate circuit closes the contact A closed contact pulls the input low. Schmitt-trigger buffer Instrumentation supply Pull-up Input Signal The buffer output drives the input directly. The input reads low below VIL and high above VIH. Take VIL, VIH, the pull-up value and the maximum input voltage from the product guide. Every circuit shares the module ground.

Wake-up pin

The wake-up pin is held high internally. Switching it to power ground for longer than 20 ms, with a switch, a transistor or a relay, wakes the logger from sleep. Clamp-15 usually names an ignition-switched positive feed, so confirm the polarity before you wire it.

The wake-up pin: two readings until the polarity is confirmed REXGEN AIR · WAKE-UP PIN The wake-up pin: two readings until the polarity is confirmed A. As the manual describes: a ground-switched wake Held high inside the logger. Pulled to power ground for more than 20 ms, it wakes the logger. REXGEN Air Internal supply Held high Wake-up / Clamp-15 Mini50 pin 5 · INF4216 pin 5 Power ground · Mini50 pin 17 · INF4216 pin 22 Control Coil Switch NPN transistor Relay contact; the coil is in a separate circuit B. As the name Clamp-15 suggests: an ignition-positive sense input The pin would read the vehicle's ignition-switched positive feed. REXGEN Air Wake-up / Clamp-15 Mini50 pin 5 · INF4216 pin 5 Ignition switch + Vehicle battery Power ground · Mini50 pin 17 · INF4216 pin 22 Decision 3.11 settles which reading is right: confirm the polarity before you wire the pin. Supply wiring is not shown, and the drawing gives no voltage figures.

For the sleep and wake settings, see REXDESK: sleep and wake settings.

Status LEDs

Four LEDs on the front face show what the logger is doing.

How the status LEDs behave REXGEN · LED STATES How the status LEDs behave State Light over time What you see Off Dark Solid On without a break Slow blink On and off at a slow, steady rate Fast blink On and off rapidly Alternating A B Two LEDs light in turn LED on LED off Timing is not to scale. The LED table in each product guide says what each state means on that logger.
REXGEN Air LED states
LED Solid Blinking
LED 1 Configured to log CAN 0 Slow: logging CAN 0. Fast: CAN error. Check the connection and the bit rate.
LED 2 Configured to log CAN 1 Slow: logging CAN 1. Fast: CAN error. Check the connection and the bit rate.
LED 3 Configured to log GNSS GNSS logging active
LED 4 Not used Fast: trying to connect to the server. Slow: connected.
REXGEN Air LED patterns
Pattern Meaning
LED 1 and LED 2 blink alternately Firmware update in progress. Do not disconnect the logger.
All LEDs blink fast together Pre-sleep mode

Install the hardware

SIM card

The SIM slot is on the front face between the antenna ports, behind a lid. Fit the SIM with the gold contacts facing down and the cut corner towards the slot. Slide it straight in until it stops, then refit the lid. Never put it anywhere else, because it can fall inside the logger. For the orientation, see REXGEN Air quick start guide.

Front face of REXGEN Air twice: on the left with the SIM slot lid closed, on the right with the lid removed and the SIM card slot visible
The SIM slot lid closed (left) and removed (right).

Mounting

Mount the logger where vibration is lowest, using the four screws supplied through the corner holes. The enclosure is rated IP50, so cover the logger if you mount it where water may get in. Do not use the logger without its enclosure.

REXGEN Air with four long mounting screws lined up with the holes in its corners
Four screws through the corner holes hold the logger in place.

Antennas

REXGEN Air uses active external antennas with a 3 V supply. The blue FAKRA Code C port takes the GNSS antenna. The Bordeaux FAKRA Code D port takes the LTE antenna. Keep both connected and tight whenever the logger is powered. With a loose or missing antenna, the logger loses GNSS and LTE data.

Supply voltage and isolation

Keep the supply within +5 V to +27 V. The logger has internal protection against low-energy voltage events from supply wire noise. Do not connect the housing to ground, because this removes the reverse voltage protection.

The CAN buses and the USB port are not isolated. CAN and USB isolators are available separately. When you connect the logger to a PC over USB, disconnect its supply and take care when you plug the cable in.

Grounding and termination

CAN nodes do not need a common ground, so they may see ground offsets. Each node then sees a different single-ended bus voltage, while the differential voltage stays the same. Large offsets increase electromagnetic emissions, so remove them on emission-sensitive systems. The logger's own sensors and inputs are different. They must share the ground of its power supply.

ISO 11898 calls for a nominal line impedance of 120 Ω. Each end of the bus therefore carries a 120 Ω terminating resistor to limit reflections.

A linear CAN bus with a terminator at each end CAN BUS · TOPOLOGY A linear CAN bus with a terminator at each end CAN-H CAN-L 120 Ω terminator 120 Ω terminator ECU ECU Logger Stub: keep it short Logger ground tied to the vehicle ground Terminate only the two physical ends of the bus. With the power off, CAN-H to CAN-L measures about 60 Ω.

For more detail, see CAN bus wiring: termination, cable length and grounding.

Next: REXGEN Air: recording CAN, LIN, inputs and motion.

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