Functional description

Pin description module
Pin description robust trackers (MTi-630R/670G/680G)
Peripheral interfaces

This chapter describes the MTi 600-series pinout and gives details about the supported communication interfaces.

Pin description module

The pin map below shows the peripheral interfaces.

Pin configuration of the MTi 600-series module (bottom view)

Pin descriptions of the MTi 600-series module
Pin	Name	I/O type	Description
1	VIN	PWR	Power input
2	GND	PWR	Ground
3	CAN_H	I/O	CAN bus differential high side
4	CAN_L	I/O	CAN bus differential low side
5	RS232_TxD	O	RS232 transmitter output to host
6	RS232_RTS	O	RS232 Ready To Send output to host
7	RS232_RxD	I	RS232 receiver input from host
8	RS232_CTS	I	RS232 Clear To Send input from host
9	SYNC_IN1	I	Multifunctional synchronization input
10	SYNC_IN2	I	Multifunctional synchronization input
11	GNSS_TxD[1]	O	RS232 transmitter output to GNSS module
12	GNSS_RxD9	I	RS232 receiver input from GNSS module
13	SYNC_OUT	O	Configurable synchronization output
14	GND	PWR	Ground
15	UART_TxD	O	UART transmitter output
16	UART_RxD	I	UART receiver input

[1] Only available for MTi-670/680. Do not connect for other models.

Pin description robust trackers (MTi-630R/670G/680G)

The figure below shows the three connectors on the rugged housing of the MTi-670G/680G. The MTi-630R only features the Host Interface connector.

Connectors and pin numbers on the MTi-670G/680G housing

The table below shows the pin descriptions of the MTi-630R/670G/680G Host Interface connector.

Pin descriptions MTi-630R/670G/680G Host Interface
Pin	Name	I/O type	Description
1	CAN_H	I/O	CAN bus differential high side
2	CAN_L	I/O	CAN bus differential low side
3	SYNC_IN1	I	Multifunctional synchronization input
4	SYNC_IN2	I	Multifunctional synchronization input
5	VIN	PWR	Power input
6	RS232_CTS	I	RS232 Clear To Send input from host
7	RS232_RxD	I	RS232 receiver input from host
8	RS232_TxD	O	RS232 transmitter output to host
9	RS232_RTS	O	RS232 Ready To Send output to host
10	GND	PWR	Ground
11	SYNC_OUT	O	Configurable synchronization output
12	GND	PWR	Ground

The table below shows the pin descriptions of the MTi-680G RTCM corrections connector.

The MTi-680G RTCM corrections connector is also present on the MTi-670G, but it is unused. It should therefore be left unconnected.

Pin descriptions MTi-680G RTCM corrections connector
Pin	Name	I/O type	Description
1	V_BCKP	PWR	Backup supply for GNSS (3V3).
2	GND	PWR	Ground
3	RTCM_RxD	I	RS232 receiver input from host
4	RTCM_TxD	O	RS232 transmitter output to host

Peripheral interfaces

The MTi 600-series supports CAN, RS232, and UART interfaces for host communication. For more detailed information on the interfaces, please refer to the MTi 600-series Hardware Integration Manual.

CAN (Controller Area Network)

A Controller Area Network (CAN bus) is a robust standard designed to allow communication between devices in applications without a host computer. The CAN interface of the MTi-600 does not include a termination resistor. It can be used in a CAN bus that already incorporates the required termination. If used in a single device connection, a 120 Ω termination resistor needs to be added between the CAN_H and CAN_L pins.

RS232 with RTS/CTS flow control

The RS232 interface complies with the standard RS232 voltage levels. It includes hardware flow control through the RTS and CTS lines; the CTS line needs to be pulled up to allow the MTi to transmit its data. For more information, refer to the Hardware Integration Manual.

UART

The UART interface can be used to directly connect to an MCU at 3.3 V IO-levels. The user can configure the MTi 600-series module to communicate over UART. The UART frame configuration is 8 data bits, no parity and 1 stop bit (8N1). The UART protocol only has the TX and RX lines without any flow control.

Due to the rugged build, the UART port is not available on robust trackers (MTi-630R, MTi-670G, MTi-680G).

RTCM input port

The MTi-680G RTCM corrections connector is also present on the MTi-670G, but it is unused. It should therefore be left unconnected.

The RTCM input port on the MTi-680G can be used to provide RTCM correction messages. The port uses RS232 signalling with 8 data bits, no parity and 1 stop bit. The default baud rate on this port is 38400 bit/s, but a higher baud rate can be configured. Refer to the table below for available baud rates. Setting the baud rate is possible using MT Manager or using low level commands. Please refer to the low-level communication document for details on the SetPortConfig command and how to configure it.

The RTCM input port also outputs a GGA message at a 1 Hz interval. This GGA message is often required by NTRIP providers.

RTCM input port baud rates
baud rate [bit/s]
38k4 (default)
57k6
115k2
230k4
460k8
921k6

Create your own Knowledge Base