SE873 Family Product User Guide
Electrical Interface
1VV0301216
Rev.4
Page 39 of 69
2018-08-24
UART Operation
See section
8.5.1 Primary Serial Port Configuration
to specify UART interface for the primary
port..
The secondary port is configured by loading the appropriate FW.
Default: NMEA at 9600 bps, 8-bit, No parity, and 1 stop bit.
Upon power up, the module will communicate using a standard asynchronous 8 bit protocol with
output messages appearing on the TX line and input commands and data being received on the
RX line. The UART can operate at baud rates from 4800 bps to 1.2288 Mbps, however speeds
above 115,200 bps have not been fully tested and verified.
If the module is operated in TricklePower mode, a baud rate of at least 38,400 is recommended.
This reduces the time required to empty the output buffer and allows the receiver to drop into the
low power state for a longer period of time.
The minimum recommended baud rate for OSP is 38400, or 115200 if debug data messages are
enabled.
Use the Query/Rate Control
PSRF103
command to enable and disable output NMEA messages
and set their output rates.
Flow control is disabled by default.
Use the OSP
MID 178,70
command to enable/disable flow control on primary first port.
After configuration, the pins are defined below:
Pin Name
UART Function
Primary Port
TX
Transmit Data (TX)
RX
Receive Data (RX)
GPIO6
CTS (if enabled)
GPIO7
RTS (if enabled)
Secondary Port
TX1
Transmit Data (TX1)
RX1
Receive Data (RX1)
Table 8-10 UART Pin Assignments
Summary of Contents for SE873 Series
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