Connect an OEM-IMU-µIMU-IC-UART Directly to an OEM7 Receiver

The OEM-IMU-µIMU-IC-UART can connect directly to an OEM7 receiver using a serial port connection.

The OEM-IMU-µIMU-IC-UART serial port uses RS-422 signal levels. Since most OEM7 receiver card ports use LVCMOS signal levels, an RS-422 line driver is needed to convert from LVCMOS to RS-422. The exception is COM1 on the OEM729 that operates at RS-232 or RS-422 levels.

The interface to the OEM-IMU-µIMU-IC-UART must provide:

  • a Micro-D 31 pin male connector

    This connector mates with the connector on the OEM-IMU-µIMU-IC-UART. See Figure: OEM-IMU-µIMU-IC-UART Pin Out.

  • an RS-422 serial port connection to the OEM7 receiver

    For most OEM7 receiver cards, the connection must include an RS-422 line driver.

    If using COM1 on an OEM729, an RS-422 line driver is not required. However, the COM1 protocol must be set to RS-422 using the SERIALPROTOCOL command.

    Use COM1 or COM2 on the PwrPak7 to connect to the OEM-IMU-µIMU-IC-UART. These ports can be set to RS-422 protocol using the SERIALPROTOCOL command.

  • a 5.0 VDC (±0.5 VDC) regulated power supply

    Install a user supplied 1.8 A slow blow fuse to the positive pole of the power source to protect the power supply wiring and your warranty.

  • a 3.3 V differential to single ended transceiver for the SYNC signal

Refer to Table: Connect an OEM-IMU-µIMU-IC-UART Directly to an OEM7 Receiver or Table: Connect an OEM-IMU-µIMU-IC-UART Directly to an OEM7 Receiver for the connections required between the IMU and receiver.

OEM-IMU-µIMU-IC-UART Pin Out

Pins not shown on the following tables are not connected.

OEM7 Receiver Card to OEM-IMU-µIMU-IC-UART Pin Connections

µIMU UART

RS-422 Line Driver

Receiver

 

Pin

Pin Name

Output

Input

Pin Name

Description

1-2

GND

–

–

–

Any receiver ground pin

3

DATA_P

RS422 B+

–

–

Part of RS-422 transmit pair from the µIMU UART

4

DATA_N

RS422 B-

–

–

Part of RS-422 transmit pair from the µIMU UART

7-8

GND

–

–

–

Any receiver ground pin

16

SYNCOUT_N

–

–

EVENT_IN2

OEM719: 7
OEM7600: 29
OEM7700: 29
OEM7720: 29

Part of the differential sync signal (ToV) pair from the µIMU UART.

The SYNCOUT_N and SYNCOUT_P are an RS-422 compatible differential pair and must be converted to a 3.3 V single ended signal before being input to EVENT_IN2.

17-19

5V Pwr

–

–

–

5 VDC power supply

20-22

GND

–

–

–

Connect to power supply Ground. Follow grounding best practices.

30

RESETIMUx

–

–

–

Recommended to connect to a “power good” signal from 5V power supply. May be left no connect if “power good” signal is unavailable.

31

SYNCOUT_P

–

–

EVENT_IN2

OEM719: 7
OEM7600: 29
OEM7700: 29
OEM7720: 29

Part of the differential sync signal (ToV) pair from the µIMU UART.

The SYNCOUT_N and SYNCOUT_P are an RS-422 compatible differential pair and must be converted to a 3.3 V single ended signal before being input to EVENT_IN2.

–

–

–

LVCMOS B IN

COMx_RXD

Any receiver COM port receive pin

–

–

–

GND

 

Any receiver ground pin
OEM729 COM1 or PwrPak7 to OEM-IMU-µIMU-IC-UART Pin Connections

µIMU UART

Receiver

  

Pin

Pin Name

Pin

Pin Name

Description

1-2

GND

–

–

Any receiver ground pin

3

DATA_P

OEM729 COM1: 18

PwrPak7 COM1: 3
               COM2: 20

COMx_RXD+

Part of RS-422 transmit pair from the OEM-IMU-µIMU UART

4

DATA_N

OEM729 COM1: 15

PwrPak7 COM1: 4
               COM2: 12

COMx_RXD-

Part of RS-422 transmit pair from the OEM-IMU-µIMU UART

7-8

GND

–

–

Any receiver ground pin

16

SYNCOUT_N

OEM729: 7

PwrPak7: 23

EVENT_IN2

Part of the differential sync signal (ToV) pair from the OEM-IMU-µIMU UART.

The SYNCOUT_N and SYNCOUT_P are an RS-422 compatible differential pair and must be converted to a 3.3 V single ended signal before being input to EVENT_IN2.

17-19

5V Pwr

–

–

5 VDC power supply

20-22

GND

–

–

Connect to power supply Ground. Follow grounding best practices.

30

RESETIMUx

–

–

Recommended to connect to a “power good” signal from 5V power supply. May be left no connect if “power good” signal is unavailable.

31

SYNCOUT_P

OEM729: 7

PwrPak7: 23

EVENT_IN2

Part of the differential sync signal (ToV) pair from the OEM-IMU-µIMU UART.

The SYNCOUT_N and SYNCOUT_P are an RS-422 compatible differential pair and must be converted to a 3.3 V single ended signal before being input to EVENT_IN2.

For the location of the receiver ground pins and transmit and receive pairs, refer to OEM719 Interface Connector, OEM729 Interface Connectors, OEM7600 Interface Connector, OEM7700 Interface Connector, OEM7720 Interface Connector or PwrPak7 Connectors.