ICP DAS USA I-87211W User Manual page 52

There will be no response if the command syntax is incorrect,
there is a communication error, or there is no module with the
specified address.
Examples:
Command: #**
Response: No response
Send the synchronized data command. There is
no response to this command.
Command: $014
Response: !1010000
Reads the synchronized data for module 01. The
module returns the synchronized data and sets the
status byte to 1 to indicate that this is the first time
the synchronized data has been read. The Digital
Output status is 01.
Command: $014
Response: !0010000
Reads the synchronized data for module 01. The
module returns the synchronized data and sets the
status byte to 0 to indicate that the synchronized
data has been read. The Digital Output status is
01.
Related Commands:
Section 2.2 #**
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I-87211W User Manual