Chapter 1 - About the Modbus Protocol Converter
5
Digital inputs
terminals
The digital inputs are opto-isolated and are found at the top terminal block with
following pin numbers:
The voltage levels for the logic states are:
The status of the inputs can be read as Internal Registers.
The internal registers can be read from an external device if the gateway
functionality is enabled. See paragraph - Ethernet Settings (Modbus TCP) at
page 30 for more information.
RS-485
interface
terminals
The following pins on the top terminal block are used for the RS-485 interface:
Normal wiring diagram Modbus terminal A and B.
Note:
The RS-485 interface can not be used at the same time as the terminal block
interfaced RS-232.
RS232
iterface
terminals
The following pins on the top terminal block are used for the RS-232 interface:
Note:
The RS-232 interface can not be used at the same time as the RS-485 interface.
Pin no.
Description
20
Digital Input Common
21
Digital Input 1 +
22
Digital Input 2 +
Logic state
Description
High
10...24 V
Low
0...2 V
PIN no.
Description
13
RS-485 Line B
14
RS-485 Line A
15
Common
A
B
A
B
Modbus
device
Protocol
converter
PIN no.
Description
15
Common
16
RS-232 Transmit (Ouput)
17
RS-232 Receive (Input)
Summary of Contents for DY-5121
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