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Appendix B:
MiniPlex-41USB Proprietary NMEA commands
The MiniPlex-41USB multiplexers support some NMEA commands through proprietary NMEA
sentences. They also generate certain proprietary NMEA sentences in some modes of operation or
as a response to NMEA commands.
All commands have the following format:
$PSMDxx
$P:
Start of a proprietary command. Dictated by the NMEA standard.
SMD: ShipModul manufacturer’s mnemonic.
xx:
Two- or three-character command code.
For ease of manual configuration, the commands issued to the multiplexer do not require a
checksum. Sentences output by the multiplexer always contain a checksum. Sentences output by
the multiplexer always contain a checksum, denoted with *hh in the descriptions below.
Command reference
VER – Get Version
Retrieves version information from the multiplexer. The multiplexer responds with the following
version sentence:
$PSMDVER,1.00,MiniPlex-41USB,1020f9a3*hh<CR><LF>
1.00:
software version number
MiniPlex-41USB:
product descriptor
1020f9a3:
serial number
CF – Configuration
This sentence sets the configuration of the multiplexer. The same sentence is sent by the
multiplexer in response to a CFQ sentence.
Command: $PSMDCF,b,m<CR><LF> or
$PSMDCF,b,m*hh<CR><LF>
b: baudrate selector: 0 = 4800 baud
1 = 9600 baud
2 = 19200 baud
3 = 38400 baud
m: mode selector:
0 = Server mode
1 = Hub mode
2 = Auto mode
When sending this command to the multiplexer, it is not necessary to specify every field when only
one configuration parameter has to be changed. Fields preceeding the one to be changed can be
left blank. Fields after the one to be changed may be omitted. When for example only the mode
must be changed, the command ‘$PSMDCF,,1’ may be sent. The field ‘b’ is left blank.
