CNI RM85x, User Manual

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CNI proprietary protocol commands
05-10-2007 CNI Engineering S.r.l.
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4.1.5 Read I/O command
This command requests the terminal to return data on the states of its I/O devices: knob, override/s,
and keys.
Byte Command Response
01 STX STX
02 Node Node
03 CmdDefault CmdDefault StatusBit
04 0x00 D1
05 CRC D0
06 ETX D3
07 D2
08 CRC
09 ETX
Meaning of returned data
The meaning is determined by the first
StatusBit
bit according to the following table.
First
StatusBit Meaning D0 Meaning D1 Meaning D2 Meaning D3
0 Bit by bit status for
keys 1 to 8 Bit by bit status for keys
9 to 16 Bit by bit status for
keys 17 to 24 Bit by bit status for
keys 25 to 32
1 1
st
override status 2
nd
override status High byte of knob
status Low byte of knob
status
Example:
To send the read I/O command to the terminal at node address 0 twice, receiving in
response an I/O status showing that key 18 is pressed, override 1 is set to 1, override 2 to 5 and the
knob has been turned to a value of 1063 (0x0427).
First send:
Byte Command Response
01 0x02 (STX) 0x02 (STX)
02 0x00 (Node) 0x00 (Node)
03 0x00 (CmdDefault) 0xc (CmdDefault) 0x0 (StatusBit)
04 0x00 0x00 (D1)
05 0x00 (CRC) 0x00 (D0)
06 0x03 (ETX) 0x00 (D3)
07 0x02 (D2; [0x1b 0xfd]=0x02)
08 0x3d (CRC)
09 0x03 (ETX)
Second send:
Byte Command Response
01 0x02 (STX) 0x02 (STX)
02
0x00 (Node) 0x00 (Node)
03 0x00 (CmdDefault) 0xc (CmdDefault) 0x1 (StatusBit)
04
0x00 0x05 (D1)
05 0x00 (CRC) 0x01 (D0)
06
0x03 (ETX) 0x04 (D3)
07
0x27 (D2)
08
0x19 (CRC)
09
0x03 (ETX)