the Plc program for new barcode reader

ghost-ronald

Member
Join Date
Aug 2007
Location
Shenzhen
Posts
1
Hello.i want to replace the old barcode reader(symbol sl1220) with new type(symbol ms2204)and the barcode reader worked in host mode...
the plc send the read command packet to barcode through a1sj71uc24-r2 module,the command packet is :

length opcode messagesource status checksum
04H E9H 04H 08H ?(2 byte)

my question is that how to identify the checksum?


thanks for your any help
ronald
 

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