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2. DCON Protocol
All communication with DGW-521 consists of commands
generated by the host and responses transmitted by the DGW-
521 modules. Each module has a unique ID number that is used
for addressing purposes and is stored in non-volatile memory.
The ID is 01 by default and can be changed using a user
command. All commands to the modules contain the ID
address, meaning that only the addressed module will respond.
The only exception to this is command ~**, which is sent to all
modules, but in these cases, the modules do not reply to the
command.
Command Format:
Leading
Character
Response Format:
Leading
Character
CHKSUM
A 2-character checksum that is present when the
checksum setting is enabled.
CR
End of command character, carriage return
(0x0D)
22
Module
Command [CHKSUM] CR
Address
Module
Address
DGW-521 User Manual, Rev. A1.0
Data
[CHKSUM] CR
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