Moore APACS ACM connectivity to 3100-MCM
Problem Solution Overview
We performed testing between the subject device and our 3100-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 supported Modbus functions 1, 2, 3, 4, 5, 6, 15 & 16
The purpose of our testing is to assure a level of compatibility in the communications between the two products. Through this testing, we attempt to identify problem areas that may arise when implementing the interface in the field.
Configuration:
The product testing was performed with the following settings used:
- Baud: 19200
- Parity: Even
- Stop: 1
- Mode: RTU Master Mode
- Physical Connection : RS-232
The Module Configuration used in our testing was as follows:
|
Address
|
0
|
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9
|
|
N7:0
|
-32768
|
0
|
6
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
|
N7:10
|
1
|
1
|
6
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
|
N7:20
|
4
|
1
|
2
|
130
|
150
|
0
|
0
|
0
|
0
|
4
|
This configuration, in combination with the example ladder logic referenced below, generates the following memory map:
N10:0 to N10:129 - Slave 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
|
7
Polling
Time
Preset
|
|
N7:50
|
1
|
2
|
1
|
0
|
16
|
0
|
0
|
0
|
|
N7:60
|
1
|
2
|
3
|
0
|
10
|
10
|
0
|
0
|
|
N7:70
|
1
|
2
|
3
|
500
|
2
|
20
|
1
|
0
|
|
N7:80
|
1
|
2
|
6
|
200
|
1
|
1
|
0
|
0
|
|
N7:90
|
1
|
2
|
16
|
201
|
4
|
2
|
0
|
0
|
Our test command list performs the following functions.
Cable Connection:
The physical connection which was used during testing was as follows:
|
3100-MCM
Module
|
|
APACS
ACM
|
|
2 TXD
|
------------------------
|
Pin 3
|
|
3 RXD
|
------------------------
|
Pin 2
|
|
7 GND
|
-----------|
|
Pin 5
|
|
4 RTS
|
-----------|
|
|
|
5 CTS
|
|
|
Additional Comments and Observations:
- You must use type 1 when retrieving floating point numbers.
|
