Au Gateway 1 (GW1) is an electric gauge gateway interface. It is capable of connecting traditional pulse driven tachometers and speedometers through J1939 or J1708/J1587 or OBD2-CAN bus. It converts received digital format of “engine speed” and “vehicle speed” information to traditional style pulse signals. In turn, these pulse signals can be used to drive traditional tachometers and speedometers. Overall, it offers a cost effective gauge driven solution for modern electric controlled engines.

How to use Au GW1 to drive pulse-driven tachometer

Features

• Nominal Power Supply: +12V DC or +24V DC
• Operating Electric Current: 65mA typical, 250mA max
• Operating Temperature: -40°F to 185°F (-40°C to 85°C)
• TVS (Transient Voltage Suppressor) protection
• Size: 3-1/8 inch L X 1-11/16 inch W X 13/16 inch H (78mm X 42mm X 21mm)
• Enclosure Color: Black and Translucent Red
• 1 communication LED indicator
• 12 editions to choose from: SAE J1939 CAN network, J1708/J1587 network, or OBD2-CAN network
• RS232 side DB9 female connector(115.2K baud rate): for data monitoring and device configuration.
• BUS side DB9 male connector : for power, network, and pulse output.
• Configurable tachometer pulse rate
• Drive standard pulse-driven tachometers and speedometers
• OBD2-CAN Protocols: SAE J1979, SAE J1979-2; ISO15031, ISO 27145, ISO 15765;

Pin out Definition

There are two DB9 connectors: a DB9 female connector on RS232 side, and a DB9 male connector on "BUS" side.

• The RS232 connector (115.2K baud rate): Can be used for CAN data monitoring and device configuration.
• The BUS connector provides power supply, J1939 CAN, J1708/J1587 bus input, pulse output for speedometer and/or Tachometer. The pin out is illustrated in the following figure.

Typical topology

Au GW1 is a handheld gateway device. It can run independently without a computer.

On the RS232 side, Au Gateway 1 (GW1) can be connected to a computer through a USB to RS232 convert cable (part #: CBL-USB-01). Please note that PC toolset is used only for configuration purposes (e.g. cylinder number or Hz vs. MPH). Computer is not necessary during general use.

On the Bus side, a cable (part #: CBL-GW1-001) is used to connect GW1-J1939 to J1939 CAN bus, tachometer, and speedometer. Note: All devices must use the same reference ground.

Output signal - Engine RPM (for Tachometer)

For GW1-J1939-001 or GW1-J1939-003, Engine RPM is received from J1939 bus.

For GW1-J17089-001 or GW1-J1708-003, Engine RPM is received from J1708 bus.

For GW1-OBD29-001 or GW1-OBD2-003, Engine RPM is received from OBD2-CAN bus.

For GW1-COMBO-001 or COMBO-003, Engine RPM could come from either J1939, J1708, or OBD2-CAN bus, if multiple signal from different network co-exist at the same time, the priority descend in the sequence of J1939 > J1708 > OBD2-CAN.

An amplitude of +5V square-wave pulse will output to engines with certain cylinder numbers.

Default factory tachometer pulse output rate for GW1 is set for 4 cylinder engines (4 strokes).

Valid Engine Speed (input and output) is from 0 RPM to 8031.88 RPM (J1939) or from 0 RPM to 16383.75 RPM (J1708/J1587, OBD2-CAN).

GW1 can be configured in-field to specific cylinder number (1 to 12) for different tachometers by using Au GW1 Toolset.

Output signal - Vehicle Speed (for Speedometer)

For GW1-J1939-002 or GW1-J1939-003, Vehicle Speed is received from J1939 bus.

For GW1-J1708-002 or GW1-J1708-003, Vehicle Speed is received from J1708 bus.

For GW1-OBD2-002 or GW1-OBD2-003, Vehicle Speed is received from OBD2-CAN bus.

For GW1-COMBO-002 or COMBO-003, Vehicle Speed could come from either J1939, J1708, or OBD2-CAN bus, if multiple signal from different network co-exist at the same time, the priority descend in the sequence of J1939 > J1708 > OBD2-CAN.

An amplitude of +5V square-wave pulse will output at approximately 1.7881 Hz per MPH. e.g. a 107.286 Hz (60 * 1.7881 = 107.286) pulse output means a 60 MPH vehicle speed.

Default factory speedometer pulse output rate for GW1 is set at 1.7881 Hz/MPH.

Valid Vehicle Speed (input and output) is from 0.1 MPH to 155.96 MPH (J1939) from 0.1 MPH to 127.5 MPH (J1708/J1587) or from 0.1 MPH to 158.45 MPH (OBD2-CAN).

GW1 can be configured in-field to specific frequency for different speedometers.

GW1 with Tachometer and Speedometer pulse output

It converts J1939, OBD2-CAN, J1708/J1587 signals to Tachometer and Speedometer pulse output

GW1 Toolset

To configure GW1, connect it to a PC's RS232 connector through a USB to RS232 convert cable (part #: CBL-USB-232). Install the GW1 toolset software on the PC, then change the cylinder number on GW1 toolset as shown in the following picture.

Au GW1 toolset can be downloaded from our website at Au GW1 Toolset