REBEL LTPinout

REBEL LT: connector pinouts

Updated

Find the pin assignments and electrical limits for the REBEL LT USB connector, 25-way OBD and INST connector and antenna sockets.

Connectors on REBEL LT

REBEL LT (ordering code INF2101) has these connectors:

  • USB. A USB type B receptacle for data transfer between the PC and the logger.
  • OBD and INST. A male 25-way D-Sub with nuts. It carries 2 CAN channels, 1 K-Line (ISO 9141) and 4 analogue inputs. It also carries the digital inputs and outputs, the supply and ground, a +4.5 V instrumentation supply output and the wake-up pin.
  • GPS. An optional male SMB socket for the external GNSS antenna.
  • Cellular. An optional male RP-SMA socket for the cellular antenna, labelled GPRS on older units.
  • SD card slot. It sits behind a flap on the outside of the logger. Press the flap at the top and lift it to reach the card.

The supplied INF4203 cable breaks the 25-way connector out to standard 9-way D-Subs for CAN and power. To reach the analogue and digital channels, you need the INF4204.1 multi-connect cable. For both cables, see REBEL breakout cables: INF4203 and INF4204.1 multi-connect pinouts.

USB connector

REBEL CT and LT USB connector, type B USB TYPE B · FEMALE REBEL CT and LT USB connector, type B Front view looking into the USB receptacle on the logger. 1 2 3 4 2D− 1VBUS +5 V 3D+ 4GND Power Ground Linked pins are a differential pair
REBEL LT USB connector, type B receptacle
Pin Signal
1 VBUS, USB supply 5 V
2 D−, USB data minus (NRZI line coding)
3 D+, USB data plus (NRZI line coding)
4 Ground

The USB port is galvanically isolated. This protects the logger and your PC from voltage spikes and ground loops. You can power the logger from USB while you configure it on the bench.

OBD and INST connector

The OBD and INST connector is a male 25-way D-Sub with nuts. The drawing shows the face of the connector on the logger.

REBEL LT OBD & INST connector, 25-way D-sub D-SUB 25 · MALE REBEL LT OBD & INST connector, 25-way D-sub Front view of the male connector on the logger. 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 1Analogue in 3 2NC 3NC 4Analogue in 1 5Wake-up 6CAN1-L 7CAN0-L 13NC 12Digital I/O 0 11Digital I/O 2 10+4.5 V instr. supply 9Supply +4.5 to +36 V 8K-Line 14Analogue in 2 15NC 16NC 17Analogue in 0 18Analogue GND 19CAN1-H 25NC 24Digital I/O 1 23Digital I/O 3 / +Vd 22Power GND 21GND 20CAN0-H Power Ground CAN bus pins Linked pins are a differential pair NC: not connected
REBEL LT OBD and INST connector, male 25-way D-Sub
Pin Signal Notes
1 Analogue input 3 Keep within -10 to +10 V
2 Not connected Leave unwired
3 Not connected Leave unwired
4 Analogue input 1 Keep within -10 to +10 V
5 Wake-up Pull to ground for more than 20 ms to wake the logger from sleep
6 CAN-L, CAN 1 Medium-speed bus (MS)
7 CAN-L, CAN 0 High-speed bus (HS)
8 K-Line One-wire bus to ISO 9141
9 Supply 4.5 to 36 V DC
10 +4.5 V instrumentation supply 100 mA maximum, see the limits below
11 Digital I/O 2 Input or output, see the limits below
12 Digital I/O 0 Input or output, see the limits below
13 Not connected Leave unwired
14 Analogue input 2 Keep within -10 to +10 V
15 Not connected Leave unwired
16 Not connected Leave unwired
17 Analogue input 0 Keep within -10 to +10 V
18 Analogue ground Reference for the analogue inputs
19 CAN-H, CAN 1 Medium-speed bus (MS)
20 CAN-H, CAN 0 High-speed bus (HS)
21 Ground Signal ground, for example to pin 5 of the vehicle OBD connector
22 Power ground For example to pin 4 of the vehicle OBD connector
23 Digital I/O 3 or auxiliary power output +Vd Can power one instrumentation module
24 Digital I/O 1 Input or output, see the limits below
25 Not connected Leave unwired

REBEL LT has no LIN interface, so pins 2, 3, 13, 15, 16 and 25 are unused. Some older documents labelled pins 2, 3, 15 and 16 as Ethernet. Leave them unwired.

Electrical limits

Earlier documentation gives two sets of digital I/O limits. The table uses the figures from the REBEL LT specification.

REBEL LT pin limits
Pin or function Limit
Analogue inputs Measuring range ±10 V. Maximum applied voltage ±40 V.
Digital input thresholds Low below 2 V, high above 2.5 V
Digital input voltage Up to 36 V absolute maximum. Keep inputs within 0 to +12 V.
Digital output current 50 mA maximum, open collector
+4.5 V instrumentation supply (pin 10) 100 mA maximum. Above that the output voltage drops.
Supply (pin 9) 4.5 to 36 V DC, 12 V typical, internally fused with reverse-polarity protection

For wiring examples, see REBEL and K-Series: wiring the wake-up pin and digital I/O.

Antenna connectors

REBEL LT antenna sockets (optional)
Socket Type Pin 1 Pin 2
GPS Male SMB RF signal input Ground
Cellular (GPRS) Male RP-SMA RF signal input Ground

Each socket is fitted only when the logger is ordered with that upgrade, GNSS or cellular.

CAN termination

Terminate each end of a CAN bus with a 120 Ω resistor across CAN-H and CAN-L. REBEL LT has DIP switches inside for this. Set a channel's switch to on when the logger is at the end of that bus.

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.

To check a bus before you fit the logger, see CAN bus wiring: termination, cable length and grounding.

Safety warnings

Cables for REBEL LT

Cables that connect to REBEL LT
Part What it does Guide
INF4203 Two CAN breakout cable, supplied with the logger, with CAN0/PWR/K-Line and AUX/CAN1 leads REBEL breakout cables
INF4204.1 Multi-connect cable with all the CAN leads and the Dig/An lead for the analogue and digital channels REBEL breakout cables
INF4102 OBD type B plug straight to the 25-way connector OBD and power adapter cables
INF4103 OBD type B plug to a 9-way D-Sub, used with the CAN0/PWR lead OBD and power adapter cables

Next: REBEL CT: connector pinouts.

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REBEL LT

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