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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 9'600 Bd. Speeds up to 460'800 Bd are supported by ZOE-
M8B.
4.2.3 RS-232 connector
The RS-232 serial port interface can be used to connect the EVK-M8BZOE 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 Bd. 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
1, 7
Timepulse
4
EXTINT0
2
TXD, GNSS Transmit Data, serial data to EVK
3
RXD, GNSS Receive Data, serial data from EVK
5
GND
6, 8, 9
not connected
Table 4: SUB-D9 Connector pin description for EVK-M8BZOE
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 9'600 Bd. Speeds up to 460'800 Bd 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 Bd.
4.2.4 UART
The UART RX and TX of ZOE-M8B are available on the digital connector J1 with 1.8 V levels, see section 4.4 for
more information. The UART communication speed is by default set to 9'600 Bd. ZOE-M8B SiP supports speeds
up to 460'800 Bd.
4.2.5 SPI
The SPI interface pins are available on digital connector J1, see section 4.4 for more information.
If using SPI interface, the slide switch has to be set accordingly.
4.2.6 DDC (I²C)
The digital connector J1 contains pins for evaluating DDC (I²C) bus communication. For such evaluation the
interface switch must be in correct position: RS-232 / USB.
Additional pull-ups on DDC lines to 1.8 V can be installed on the EVK-M8BZOE if needed, see R4 and R6 in Figure
14.
4.3 GNSS signal inputs
The EVK-M8BZOE has two RF inputs for GNSS signals. The purpose is to have optimal performance for "no gain"
and for "high gain" use cases, that is, for passive antenna designs and active antenna designs.
UBX-17053592 - R03
Remarks
Not supported by ZOE-M8B firmware.
Can be used for aiding purposes
Early Production Information
EVK-M8BZOE User Guide
Device description
Page 12 of 33
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