EVK-M8GZOE User Guide
UBX-16030132 - R04
Device description
Page 11 of 30
Early Production Information
Interface switch
The interface switch has to be set according to whether the UART (RS232/USB) and DDC (I
²
C) or the
SPI interface is to used. See Figure 1 for location of interface switch.
☞
Only if the SPI communication interface on the digital connector is used, the interface switch
shall be switched to SPI marking. For all other communication interfaces, it shall be set to the
RS-232 / USB marking.
USB 2.0 micro connector
The USB 2.0 micro B connector can be used for both power supply and communication. On the EVK-
M8GZOE there is a USB to UART converter to the UART interface of ZOE-M8G.
The easiest way to evaluate the EVK-M8GZOE operation is to connect the board to a PC by a micro
USB cable and then to use u-center to configure and monitor the GNSS function.
When the board is connected to the PC, Windows creates a virtual COM port to the PC. This newly
created virtual COM port needs then to be selected on the u-center application.
The UART communication speed is by default set to 9600 baud. Speeds up to 460,800 baud are
supported by ZOE-M8G and ZOE-M8Q.
RS-232 connector
The RS-232 serial port interface can be used to connect the EVK-M8GZOE board to a PC or to other
evaluation host system.
Connect using a straight RS-232 serial cable with male and female connectors. The maximum cable
length is 3 meters. To configure the RS-232 port, use the CFG-PRT command in the u-center
application. The maximum supported operating baud rate is 460,800 baud. 8 data bits, 1 stop bit
and no parity is used. Neither handshaking signals nor hardware flow control signals are available.
The serial port operates in asynchronous mode.
The 9-pin D-SUB female connector is assigned as listed in Table 4.
Pin Nr.
Assignment
Remarks
1, 6
Timepulse
Can be used for aiding purposes
4
Extint0
Can be used for aiding purposes
2
TXD, GNSS Transmit Data, serial data from EVK
3
RXD, GNSS Receive Data, serial data to EVK
5
GND
7, 8, 9
not connected
Table 4: SUB-D9 Connector pin description for EVK-M8GZOE
If the RS-232 interface is used, the device must be powered either by USB cable or by the digital
connector J1 connecting 5V to pin 2 and GND to pin 18.
The UART communication speed is by default set to 9600 baud. Speeds up to 460,800 baud can be
used if the host PC system can reliably support those. Please note that the RS232 of many PCs can
only support up to 115,200 baud.
