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MX421 Installation Manual
MX421-10 Connector Configuration
The MX421-10 is a smart GPS only antenna configuration. It transmits the NMEA
data at 4800 baud, 8 bits, 1 stop, no parity. Figure 9 shows the MX421-10 connector
pin assignments.
1
Pin#
Wire
Signal
10 Prpl/Gry 1 PPS -
9 Purple 1 PPS +
8 White RTCM In +
7 Yellow RTCM In -
6 Green GPS Out +
5 Orange GPS Out -
4 Brown LPM In+
3 Blue LPM In-
2 Red +12~32 VDC
1 Black Negative GND.
2
3
4
5
6
7
8
9
10
Figure 9 - Interface Cable Pin Configuration for MX421-10
Where:
Pins 1 & 2: are used for GND and 12 VDC input.
Pins 3 & 4: Leica proprietary message (LPM) input port.
Pins 5 & 6: GPS output to the MK12, MX420 (CDU) or other NMEA 183
compatible devices.
Pins 7 & 8: connect to an external beacon receiver like the Leica MX41R.
Pins 9 & 10: 1 Pulse Per Second (PPS) output
External Differential Beacon Receiver Connection
Differential corrections from an external beacon receiver can be connected to
the MX421-10 (GPS only) model. Connections are done directly to yellow (Pin
7) and white (Pin 8) wires of the MX421-10 I/O cable. It will accept RTCM SC-
104 signal at 4800 baud.