UM220-IV L User Manual
UC-00-M15 EN R1.4
Product Introduction
5
If the position of UM220-IV L antenna changes, the command CFGTM must be sent again to
switch the timing mode back to the optimized position mode to recalibrate the antenna position.
Refer to
UM220-IV L_ Protocol Specification
for more details.
Positioning Timing
Positioning timing is the only timing mode that supports dynamic timing. In this mode,
UM220-IV L calculates the antenna position and time in real time. The timing quality
depends on the satellite environment, and it is difficult to guarantee the timing accuracy.
1.6
Pulses per Second (1PPS)
UM220-IV L module provides a pulse width output and 1PPS signal of which the pulse
polarity is adjustable, and can be configured and queried through CFGTP. TIMTP is used
to describe the related 1PPS information including the corresponding time and time
accuracy indicators.
1.7
UART
Two UART interfaces are integrated in the UM220-IV L module. UART1 is the master
serial port, supports data transmission and firmware upgrade, the I/O signal type is
LVTTL. The default baud rate varies according to the version of firmware and the baud
rate can be configured by users
8
. Please ensure that UART1 is connected to a PC or
external processor to support firmware upgrade.
Serial 2 only supports data transmission and is unavailable for firmware upgrade, only
for backup.
1.8
Protocol
Table 1- 3 Supported Interface Protocols
Protocol
Type
NMEA0183
I/O, ASCII, NMEA3.0, NMEA4.1
（
Default output
）
Unicore Protocol
I/O, ASCII, Unicore Protocol
RTCM
9
Input, RTCM3.2
9
Refer to UM220-IV L_Protocol Specification for more details
