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7 Data Output Protocol
The output protocol contains all four display parameters. They are output in the display sequence 1
... 4 and in the display format.
e.g. Weather Display protocol:
(STX)xxx.x xxx.x xxx.x xxxxx*HL(CR)(ETX)
- ' ' is used as a separator
- Erroneous parameters are replaced by "???.."
- Missing parameters are replaced by "---.."
- Measured values are output with a leading ' ' e.g. ' ' 0.1
Abbreviations:
' '
= blank character
"
*
"
= identifier for checksum
"
H
"
= checksum high
"
L
"
= checksum low
<
STX
>
= start of text
<
CR
>
= carriage return
<
LF
>
= line feed
The checksum is generated by the XOR function from the characters between <STX> and "*" 2…9
(starting with Hex00). The 8-bit checksum is then split into two ASCII characters (high and low
nibble) with a value range from 0...F (Hex).
Note for COM1 Input:
The COM1 interface can be configured with any protocol. See Section 4.2.
