ICP DAS USA M-7026, User Manual

Page: 23 / 185

M-7026 User Manual Rev: 1.5 Date: 2016/03/10
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2. DCON Protocol
All communication with the M-7026 module consists of commands
generated by the Host and responses transmitted by the module.
Each module has a unique ID number that is used for addressing
purposes and is stored in non-volatile memory. The ID is set to 01
by default and can be changed by sending the appropriate user
command. All commands to the modules contain the ID number as
the address, meaning that only the addressed module will respond.
There are two exceptions to this, however: the #** command
(Section 2.2) and the ~** command (Section 2.36), which is sent to
all modules, but, in these cases, the modules do not respond to the
command.
Command Format:
Delimiter
Character
Module Address Command [CHKSUM] CR
Response Format:
Delimiter
Character
Module Address Data [CHKSUM] CR
CHKSUM A 2-character checksum that is present when the
checksum setting is enabled. See Sections 2.1 and 5.1
for details.
CR End of command character, carriage return (0x0D)
Calculating the Checksum:
1.
Sum the ASCII codes of all the characters contained in the
command/response string, except for the carriage return
character (CR).
2.
The checksum is equal to the sum value masked by 0FFh.