SE868-V3 Product User Guide
1VV0301205 r4 – 2016-01-20
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.
Page 43 of 76
Mod. 0805 2015-02 Rev.4
9.7.2.
Host Port Configuration for 2nd Port (port 1)
The second host port default configuration in determined in the firmware build.
9.7.3.
UART Operation
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 OSP MID 178,70 command to enable/disable flow control on the first port.
Use the Query/Rate Control (PSRF103) to enable and disable output NMEA messages and set
their output rates.
After configuration, the pins are defined as follows:
Pin Name
UART Function
First Port
TX0
Transmit Data (TX)
RX0
Receive Data (RX)
GPIO6
CTS (if enabled)
GPIO7
RTS (if enabled)
Second Port
TX1
Transmit Data (TX1)
RX1
Receive Data (RX1)
Table 9-8 UART Pin Assignments
Note: Flow control is disabled by default.
