TReX User Manual v2.14 Firmware
Protocols
Serial input into and out of the TReX can be formatted differently by selecting an appropriate
protocol handler.
WT Protocol
The
WT Protocol
is the default protocol used by WTE products. It allows for a variety of over
the air transport methods (such as POCSAG paging) to be used and a variety of baud rates.
The WT Protocol also supports the use of macros to embed variable information in messages
such as system voltage, time etc. – see
Variable Content Macros
.
Transmitting Messages
Message format:
WTNNNNNNNABC<SPACE>MMMMM<CR>
Where:
WT
are the 2 characters WT
NNNNNNN
are 7 ASCII digits from 0000000-9999999
A
is the Transport method:
A = POCSAG Alpha
N= POCSAG Numeric
W= POCSAG WTE (WTE 8 bit format allowing all 8 bit characters to be
transmitted)
S= Message Payload sent directly to serial port without transmission. See note
“Serial Only Transport of Messages”.
B
is the Level 1-9. Note that POCSAG only supports levels 1-4 which is the same as
the “Beep Level”.
C
is the data rate (specified in channel width ranges):
25 kHz Channel Space Settings
0 = 512 Baud 2 Level FSK
1 = 1200 Baud 2 Level FSK
2 = 1600 Baud 2 Level FSK
3 = 2400 Baud 2 Level FSK
4 = 3200 Baud 4 Level GFSK
5 = 4800 Baud 2 Level GFSK
6 = 9600 Baud 2 Level GFSK
7 = 9600 Baud 4 Level GFSK
8 = 16000 Baud 4 Level GFSK
© WTE Limited, 2018 – Christchurch New Zealand
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