Data Protocol Ild1402; Setup Of The Commands - MICRO-EPSILON ILD1402-5 Instruction Manual

Serial Interface RS422
8.3
8.3.1
The commands for the sensors are comprised of command data which are transmitted in full duplex mode.
Each command packet is comprised of a whole number multiple of 32 bit words (see Fig. 20).
1
2
3
4
5
6
Fig. 20:
Since most serial interfaces use an 8 bit data format, 4 consecutive bytes are combined into a 32 bit word.
Each command packet has a header consisting of two 32 bit words followed by the command and, if re-
quired, other data as well. The top two bits (No. 31 and 30) are always "0" in the transmitted command.
optoNCDT 1402

Data Protocol ILD1402

Setup of the Commands

31 24 23 16 15
Header
ID
Command (16 Bit) Package length (16 Bit)
Data 1
...
Data (n)
Structure of a command packet
8 7 0
Start word
Sensor identifier,
e.g. "ILD1"
Command code
Contents
Command header (2 words)
Data word quantity n+2
1 Dats worf (4 Bytes)
st
...
n Data word (4 Bytes)
th
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