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This chapter describes the technical specifications of all components included in the MTi-630R-, MTi-670G- and MTi-680G Starter Kit.
The CA-USB-CONV is a USB to RS232 converter that can be connected directly to the Molex connector of the 12-pin Host Interface cable. The RS232 converter uses the RxD, TxD, RTS and CTS pins of the RS232 communication lines and powers the MTi-600 with the 5V power line of the USB.
The SYNC signals of the MTi-600 can be easily accessed on the PCB of the RS232 converter. To reveal the PCB, the two housing components need to be pulled apart. The housing parts are fixed with press fit connections in each corner.
The figure below shows the PCB of the RS232 converter. The SYNC signals are available on pads with a 2.54 mm spacing and can be used to solder on a standard 2.54 mm pitch through hole header or wires. The table below shows the signal definitions of the pads.
RS232 converter I/O pad definitions
|
Pin number |
Designator |
Function (MTi) |
|---|---|---|
|
1 (square) |
SOUT |
SYNC_OUT |
|
2 |
S1 |
SYNC_IN1 |
|
3 |
S2 |
SYNC_IN2 |
|
4 |
GND |
Ground |
The CA-MP-USB cable is a RS232 to USB cable that has the USB converter integrated at the end of the cable and consists of the following parts:
The table below shows the pinning of the connections.
Connector pinning CA-MP-USB cable assembly
|
Function (MTi) |
Wire colour |
ODU pin no. |
|---|---|---|
|
VIN |
Red |
5 |
|
GND |
Black |
10 |
|
RS232_RTS |
Violet |
9 |
|
RS232_TxD |
Yellow |
8 |
|
RS232_RxD |
Grey |
7 |
|
RS232_CTS |
Orange |
6 |
|
SYNC_IN2 |
Red/White |
4 |
|
GND |
Blue |
12 |
|
SHIELD |
- |
SH |
The figure below shows the cable length definition (from connector end-to-end).
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Host Interface cable CA-MP-USB length definition
The CA-MP-12-OPEN is a 12-pin Host Interface cable assembly with open ends and consists of the following parts:
The table below shows the pinning of the connections. The shield of the cable is only connected on the ODU connector side.
Connector pinning Host Interface cable assembly
|
Function (MTi) |
Wire colour |
ODU pin no. |
|---|---|---|
|
VIN |
Red |
5 |
|
GND |
Black |
10 |
|
CAN_H |
Green |
1 |
|
CAN_L |
White |
2 |
|
RS232_RTS |
Violet |
9 |
|
RS232_TxD |
Yellow |
8 |
|
RS232_RxD |
Grey |
7 |
|
RS232_CTS |
Orange |
6 |
|
SYNC_IN1 |
Black/White |
3 |
|
SYNC_IN2 |
Red/White |
4 |
|
SYNC_OUT |
Blue/White |
11 |
|
GND |
Blue |
12 |
|
SHIELD |
- |
SH |
The figure below show the cable length definition (from end-to-end).
Host Interface cable length definition
The CA-MP-MTI-12 is a 12-pin Host Interface cable assembly and consists of the following parts:
The table below shows the pinning of the connections. The shield of the cable is only connected on the ODU connector side.
Connector pinning Host Interface cable assembly
|
Function (MTi) |
Wire colour |
Wire number |
Molex pin no. |
ODU pin no. |
|---|---|---|---|---|
|
VIN |
Red |
5 |
1 |
5 |
|
GND |
Black |
6 |
2 |
10 |
|
CAN_H |
Green |
1 |
3 |
1 |
|
CAN_L |
White |
2 |
4 |
2 |
|
RS232_TxD |
Yellow |
9 |
5 |
8 |
|
RS232_RTS |
Violet |
10 |
6 |
9 |
|
RS232_RxD/SYNC_IN3 |
Grey |
8 |
7 |
7 |
|
RS232_CTS/SYNC_IN4 |
Orange |
7 |
8 |
6 |
|
SYNC_IN1/ODO_1A |
Black/White |
3 |
9 |
3 |
|
SYNC_IN2/ODO_1B |
Red/White |
4 |
10 |
4 |
|
SYNC_OUT |
Blue/White |
11 |
11 |
11 |
|
GND |
Blue |
12 |
12 |
12 |
|
SHIELD |
- |
- |
- |
SH |
The figures below show the cable length definition (from connector end-to-end) and the pinning of both the Molex connector and the ODU connector. The table underneath shows the recommended mating parts for the Molex connector.
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Host Interface cable length definition
Numbering 12-pin connectors; left Molex (cable entry view), right ODU (solder cup view).
Recommended mating parts for 12-pins Molex connector
|
Part number |
Manufacturer |
Mounting |
Description |
|---|---|---|---|
|
5054331291 |
Molex |
Vertical |
1.25mm Pitch, Micro-Lock Plus PCB Header, Dual Row, Surface Mount, 0.10µm Gold Plating, 12 Circuits |
|
5054481291 |
Molex |
Right-Angle |
The CA-MP-MTI-4 is a 4-pin RTCM corrections cable assembly and consists of the following parts:
The table below shows the pinning of the connections. The shield of the cable is only connected on the ODU connector side.
Connector pinning RTCM cable assembly
|
Function (MTi) |
Wire colour |
Molex pin no. |
ODU pin no. |
|---|---|---|---|
|
Reserved / DNC |
Red |
1 |
1 |
|
GND |
Black |
2 |
2 |
|
RTCM_TxD |
Green |
3 |
4 |
|
RTCM_RxD |
White |
4 |
3 |
|
SHIELD |
- |
- |
SH |
The figures below show the cable length definition (from connector end-to-end) and the pinning of both the Molex connector and the ODU connector. The table underneath shows the recommended mating parts for the Molex connector.
Numbering 4-pin connectors; left Molex (cable entry view), right ODU (solder cup view).
Recommended mating parts for 4-pins Molex connector
|
Part number |
Manufacturer |
Mounting |
Description |
|---|---|---|---|
|
5055680481 |
Molex |
Vertical |
1.25mm Pitch, Micro-Lock Plus PCB Header, Single Row, Surface Mount, Gold Plating, 4 Circuits |
|
5055670481 |
Molex |
Right-Angle |
The supplied GNSS antenna in the MTi-670G/680G Starter Kit is the TW8889 of Tallysman (manufacturer order code: 33-8889NM-12-2900). The specifications of this antenna are listed in the following table.
GNSS RTK antenna specifications
|
Parameter |
Specification |
|---|---|
|
Typical LNA gain |
27 dB |
|
Typical LNA noise figure |
2.5 dB |
|
L1 peak band antenna gain (1575.42 – 1606 MHz)[1] |
4 dBic |
|
L2 peak band antenna gain (1215 – 1240 MHz)[1] |
4 dBic |
|
G2 peak band antenna gain (1237 – 1246 MHz)[1] |
3 dBic |
|
E5b/G3 peak band antenna gain (1189 – 1214 MHz)[1] |
1 dBic |
|
Axial ratio (max at Zenith) |
1 dB |
|
Polarization |
RHCP |
|
EMI immunity out-of-band |
50 V/m |
|
ESD circuit protection (air discharge) |
15 kV |
|
Weight |
52 g |
|
Cable length |
2.9 m |
Other specifications:
The above antenna is a patch antenna. In contrast to other antenna types such as helix antennas, patch antennas require a ground plane underneath them to operate properly. A ground plane will reduce errors due to multipathing effects, by blocking signals that can normally reach the GNSS antenna from low or sub-horizon elevations.
Adding a ground plane is not necessary when mounting the antenna directly onto a flat metal surface, such as the roof of a car. Otherwise, we recommend mounting the antenna on top of a metal plate (thickness irrelevant) with a minimum diameter of 10 cm.
For best practices or tailor-made ground planes, we recommend contacting the original manufacturer of the used GNSS antenna. Antennas that are sold by Xsens, as well as their product code and original manufacturer, are listed in this BASE article. For Tallysman patch antennas, best practices were discussed here.
In addition to creating a proper ground plane, avoid mounting the antenna underneath or in close proximity of other metal structures and electronics in order to ensure the best GNSS signal reception.
[1] Peak gain at Zenith with 100 mm diameter ground plane.