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Reading the Optocoupler Input Port
This command is used to read the current states of the optocoupler
inputs
Example: reading the optocoupler input states
A 4-byte block is transmitted and an 8-byte block is received holding the current optocou-
pler input states.
Precondition for these examples is to apply input levels (here 0xB3) at the single inputs as
per the following table:
(0 = LOW = 0...3V, 1 = HIGH = 10..30V)
Output channel
Screw terminal
Switching state
Byte
Transmit
0
08
1
00
2
01
3
00
4
5
6
7
EXDUL-581E / EXDUL-581S © 2019 by Messcomp Datentechnik GmbH
DIN7
DIN6
DIN5
18
17
16
1
0
1
Representing
Command code 1st Byte
Command code 2nd Byte
Command code 3rd Byte
Length byte
wasco
DIN4
DIN3
DIN2
15
14
13
1
0
0
Receive
Representing
08
Command code 1st Byte
00
Command code 2nd Byte
00
Command code 3rd Byte
01 (→ 4Byte)
Length byte
B3
Optocoupler input state
00
reserved
00
reserved
00
reserved
®
DIN1
DIN0
12
11
1
1
EV03
71
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