Connect an OEM-IMU-STIM300 Directly to an OEM7 Receiver

The OEM-IMU-STIM300 can connect directly to an OEM7 receiver using a serial port connection.

The OEM-IMU-STIM300 serial port uses RS-422 signal levels. Since most OEM7 receiver card ports use LVCMOS signal levels, a 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 OEM-IMU-STIM300 can also connect to any OEM7 receiver using a MEMS Interface Card (MIC). For information about using a MIC, see MIC Installation.

The interface to the OEM-IMU-STIM300 must provide:

OEM-IMU-STIM300 Pin Out

OEM7 Receiver Card to STIM300 Pin Connections

STIM300

RS-422 Line Driver

Receiver

 

Pin

Pin Name

Output

Input

Pin Name

Description

1

STIM TXD-

RS422 B-

Part of RS-422 transmit pair from STIM300

2

STIM RxD-

RS422 A-

Part of RS-422 receive pair from STIM300

3

NC

Do not connect

4

STIM TOV

EVENT_IN2

OEM719: 7
OEM729: 7
OEM7600: 29
OEM7700: 29
OEM7720: 29

Interface Circuit Required
The STIM TOV output uses 5V logic, but the OEM7 EVENT_IN lines are not 5V tolerant. A circuit to convert from 5V logic to 3.3V levels is required.

5

NC

Do not connect

6

NC

Do not connect

7

NC

Do not connect

8

5V Pwr

5 VDC power supply

9

STIM TxD+

RS422 B+

Part of RS-422 transmit pair from STIM300

10

STIM RxD+

RS422 A+

Part of RS-422 receive pair from STIM300

11

NC

Do not connect

12

GND

Any receiver ground pin

13

GND

Any receiver ground pin

14

NC

Do not connect

15

GND

Any receiver ground pin

LVCMOS A IN

COMx_TXD

Any receiver COM port transmit and receive pair

LVCMOS B IN

COMx_RXD

GND

 

Any receiver ground pin

OEM729 COM1 or PwrPak7 to STIM300 Pin Connections

STIM300

Receiver

 

Pin

Pin Name

Pin

Pin Name

Description

1

STIM TXD-

OEM729 COM1: 15

PwrPak7 COM1: 4
COM2: 12

COMx_RXD-

Part of RS-422 transmit pair from STIM300

2

STIM RxD-

OEM729 COM1: 17

PwrPak7 COM1: 1
COM2: 19

COMx_TXD-

Part of RS-422 receive pair from STIM300

3

NC

Do not connect

4

STIM TOV

OEM729: 7

PwrPak7: 23

EVENT_IN2

Interface Circuit Required
The STIM TOV output uses 5V logic, but the OEM7 EVENT_IN lines are not 5V tolerant. A circuit to convert from 5V logic to 3.3V levels is required.

5

NC

Do not connect

6

NC

Do not connect

7

NC

Do not connect

8

5V Pwr

5 VDC power supply

9

STIM TxD+

OEM729 COM1: 18

PwrPak7 COM1: 3
COM2: 20

COMx_RXD+

Part of RS-422 transmit pair from STIM300

10

STIM RxD+

OEM729 COM1: 20

PwrPak7 COM1: 2
COM2: 10

COMx_TXD+

Part of RS-422 receive pair from STIM300

11

NC

Do not connect

12

GND

 

 

Any receiver ground pin

13

GND

 

 

Any receiver ground pin

14

NC

Do not connect

15

GND

 

 

Any receiver ground pin

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.

 

OM-20000167 v12

July 2019

Email comments to NovAtel_TPUBS@NovAtel.com

7.07.01 / OM7MR0701RN0000
PP7 07.07.00 / EP7PR0700RN0000
7.06.02 / OA7CR0602RN0000