Unitech UT-1405, Instruction Manual

Page: 17 / 18

@
sales@utplindia.in +91 7046223333 , 9427301436
www.utplindia.in
www
UT-1405
TEMP. AND DIFF. PRESS. INDICATOR
15
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.
5.2 MODBUS Configuration Basic settings
The Basic settings for RS-485 Modbus protocol are as follows :
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
D- D+
3 4
UT-1405 Device-1
D- D+
3 4
D- D+
3 4
D- D+
3 4
RS-485 BUS
ADD:1 ADD:2 ADD:3 ADD:N
RS-485 BUS
Upto 256
devices
UT-1405 Device-2 UT-1405 Device-3 UT-1405 Device-256
2 core 1 sq/mm shielded cable
COMPUTER- SCADA
TEMP ALARM-2 SET POINT
TEMP ALARM-3 SET POINT
TEMP ALARM-4 SET POINT
40007
40009
40008
40010
40011
40012
40013
40014
READ / WRITE
READ / WRITE
READ / WRITE
READ / WRITE
READ / WRITE
READ / WRITE
DP ALARM-2 SET POINT
DP ALARM-3 SET POINT
DP ALARM-4 SET POINT
DP ALARM-1 SET POINT
READ ONLY
SR.
1 TEMP PRESENT VALUE [PV]
PARAMETER
ABSOLUTE ACCESS
40001
READ / WRITE
3 40003
READ ONLY
2 TEMP DECIMAL POINT 40002
READ / WRITE
4 40004
READ ONLY
5 40005
READ ONLY
6 40006
NO. ADDRESS TYPE
DP PRESENT VALUE [PV]
DP DECIMAL POINT
READ ONLY
READ ONLY
7
9
8
10
11
12
13
14
TEMP ALARM-1 SET POINT
TEMP ALL 4 ALARM STATUS
MINUTES AND SECONDS
DAY AND HOURS
40021
40023
40022
40024
40025
40026
40027
40028
40029
READ / WRITE
READ / WRITE
YEARS AND MONTH
SR.
16
PARAMETER
ABSOLUTE ACCESS
40015
18
40017 17
40016
19
40018
20
40019
40020
NO. ADDRESS TYPE
21
22
23
25
24
READ / WRITE
READ / WRITE
26
27
29
28
15
DP ALL 4 ALARM STATUS
AHU RUN STATUS [IF APP.]
READ ONLY
READ ONLY
READ ONLY
READ ONLY
READ ONLY
READ ONLY
READ ONLY
WRITE ONLY
WRITE ONLY
WRITE ONLY
WRITE ONLY MINUTES AND SECONDS
DAY AND HOURS
YEARS AND MONTH
SAVE ABOVE [26~28] DATA
NOTE : Sr. no. 22 is applicable if AHU Status digital signal is available.
N/A
N/A
N/A
N/A
N/A
N/A
N/A