Rockwell Automation 2755-SNx Adaptascan Bar Code Readers User Manual
Page 302
15–17
Downloading Match Codes via DH485 using a PLC-5 Processor and a 2760-RB Module
Publication 2755-6.8
Place the String in the Data Packet
The bar code string is sent in a data packet having this format:
3F 10 CE 01 00 03 04 00 30 33 30 30
Bar Code String
# of Characters
in Bar Code
String
Instance
Number
The following are descriptions of the data packet:
3F = DeviceNet Address (3F= 63, each reader has unique address)
10 = Set attribute (single request)
CE = 206 = Class (always 206 for match table)
01 = Instance Number (LSB)
00 = Instance Number (MSB)
03 = Attribute Number – Rule
04 = Length of String (LSB)
00 = Length of String (MSB)
30 = ASCII “0”
33 = ASCII “3”
30 = ASCII “0”
30 = ASCII “0”
Note: You can use the Windows calculator to convert decimal
values to hexadecimal.
Match Code String in Block Transfer Write
Word 0
0
1
2
3
4
5
6
7
8
N7:400
0018
0501
8001
3F10
CE01
0003
0400
3033
3030
The response of 3F90 indicates a good write of the match code.
3F90
Address (3F = 63)
Response Code (90 = Successful)
(94 = Fail)
Note: If you want to view the data after you have received the
response 3F90, set up the OLP message screen. Once the message is
setup, the response code will be overwritten by the bar code data.
Note: Refer to the next page for a description of the response code
format and codes.