Unitech UT-30X, Инструкция по эксплуатации

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5. COMMUNICATION [MODBUS RTU] PROTOCOL
5.1 Introduction
The unit can be connected in MODBUS/RTU communication data link protocol to messaging
structure, widely used to establish master - slave communications between devices. Each
device must have unique No. node address. Before starting any communication, choose a
baud rate compatible to the host device. A Modbus data sent from a master to slave tells the
selected slave what to do and what information to send back. The MODBUS/RTU protocol
works with RS232, RS485 and RS422 standards
5.2 MODBUS Configuration Basic settings
The Basic settings for RS-485 Modbus protocol are:
Band rate
Start bit
Data bit
Stop bit
Parity 9600
1
8
1
none
5.3 Register addresses for MODBUS / RTU Protocol
The addressees for RS-485 Modbus protocol are as follows :
5.4 MODBUS system schematic.
DATA+
The system schematic for RS-485 Modbus protocol are as follows :
DATA-
Ethernet
RS-232
or
RS-485
CONVERTER
UT-30X,100X
Device-1
D- D+
RS-485 BUS
ADD:1 ADD:2 ADD:3 ADD:N
RS-485 BUS
Upto 128
devices
UT-30X,100X
Device-2
UT-30X,100X
Device-3
UT-30X,100X
Device-128
2 core 1 sq/mm shielded cable
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All content are subject to change without notice
due to continuous improvements.
Doc. Ref. 1410/R04/0819
UNITECH TECHNOCRATS PVT LTD
FACTORY :- 78/1/Z/3-Makarpura G I D C . . . .,
N/R Vadasar Bridge. /p-Gayatri emple O T
VADODARA - 390010 INDIA . Gujarat,
14
COMPUTER- SCADA
UT-30X
UT-100X
MULTI CHANNEL UNIVERSAL PROCESS INDICATOR
CONTROLLER/SCANNER/DATALOGGER
D- D+ D- D+ D- D+
7 40007
READ / WRITE
9
CH : 1 SET POINT-1
40009
8 40008
READ / WRITE 10
CH : 1 SET POINT-2
40010
11 40011
12 40012
PROCESS VALUE CH : 2
PROCESS VALUE CH : 3
PROCESS VALUE CH : 4
CH : 2 SET POINT-1
CH : 2 SET POINT-2
CH : 3 SET POINT-1
CH : 3 SET POINT-2
CH : 4 SET POINT-1
CH : 4 SET POINT-2
READ ONLY
READ / WRITE
READ ONLY
READ / WRITE
READ / WRITE
READ / WRITE
READ ONLY
SR. NO.
1 PROCESS VALUE CH : 1
PARAMETER ABSOLUTE ADDRESS ACCESS TYPE
40001
READ / WRITE
3 40003
READ ONLY
2 40002
READ / WRITE
4 40004
5 40005
6 40006