Honeywell DR4500 connectivity to 3150-MCM
Problem Solution Overview
We performed testing between the subject device and our 3150-MCM product.
Solution Brief
Our testing generated the following results:
- We were able to successfully communicate with the device. (see below for configuration parameters used during the testing)
- The product supports Modbus function codes 3, 4 and 6 for data movement. These codes required for a successful connection.
Configuration:
The product testing was performed with the following settings .
- Baud: 19200
- Parity: None
- Stop: 1
- Mode: RTU Master Mode
- Physical Connection : RS-485 (2 wire connection)
The Module Configuration used in our testing was as follows:
|
Address
|
0
|
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9
|
|
N7:0
|
0
|
0
|
6
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
|
N7:10
|
1
|
6
|
6
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
|
N7:20
|
4
|
1
|
2
|
130
|
150
|
0
|
0
|
0
|
4
|
0
|
This configuration, in combination with the example ladder logic referenced below, generates the following memory map:
N10:0 to N10:129 - Slave Data
N10:200 to N10:249 - Write Data
N10:130 to N10:149 - Slave Error Table (Contains revision level information also)
N10:150 to N10:199 - Master Error Table (Contains status of commands for diagnostics)
Command List:
The following command list shows some of the commands which were used to test the communications:
|
Address
|
0
Port
Number
|
1
Slave
Number
|
2
Function
Code
|
3
Source
Address
|
4
Count
|
5
Dest.
Address
|
6
Read
Type
|
|
N7:50
|
1
|
6
|
3
|
6144
|
4
|
0
|
0
|
|
N7:60
|
1
|
6
|
4
|
72
|
2
|
10
|
0
|
|
N7:70
|
1
|
6
|
6
|
200
|
1
|
7136
|
0
|
|
N7:80
|
1
|
6
|
3
|
7136
|
1
|
20
|
0
|
|
N7:90
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
Our test command list performs the following functions.
- N7:50 This command reads process related data from DR 4500 registers 1 to 4 and places the results in N10:0 to N10:3.
- N7:60 This command reads process related data from DR 4500 address 72 and places the results in N10:10.
- N7:70 This is a conditional write command to DR4500 address 7136 which will print the contents of N10:200.
- N7:80 This command reads the DR 4500 clock register data and places results in N10:20.
Cable Connection:
The physical connection which was used during testing was as follows:
|
MCM Module
|
|
Device
|
|
TXDRXD +
|
-------------------
|
RX / TX B
|
|
TXDRXD -
|
---------------
|
RX / TX A
|
|
RTS
|
--------|
|
|
|
CTS
|
--------|
|
Jumper between RTS/CTS
on module must be installed
|
|
GND
|
|
|
For ease of installation, termination on the ProSoft module was accomplished using our screw termination adaptor for the DB-9 plug. A similar screw termination plug is also available for the DB-25 required for the 3100-MCM.
The part number for these is:
1451-9F : DB-9 to RS-422/RS-485 Screw Terminals (for 3150-MCM)
1452-25M : DB-25 to RS-422/RS-485 Screw Terminals (for 3100-MCM)
|
