HH1800 User Guide
165
Tag Field Usage
When a query is used in place of a Tag field, the query applies to the
entire
set of commands
available for the particular storage table indicated by the Storage field of the command. In
this case, the SubTag and Data fields should not be used because they are ignored by the
device.
SubTag Field Usage
When a query is used in place of a SubTag field, the query applies only to the sub- set of
commands available that match the Tag field. In this case, the Data field should not be used
because it is ignored by the device.
Data Field Usage
When a query is used in place of the Data field, the query applies only to the spe- cific
command identified by the Tag and SubTag fields.
Concatenation of Multiple Commands
Multiple commands can be issued within one Prefix/Storage sequence. Only the Tag, SubTag,
and Data fields must be repeated for each command in the sequence. If additional commands
are to be applied to the same Tag, then the new command sequence is separated with a
comma (,) and only the SubTag and Data fields of the additional command are issued. If the
additional command requires a different Tag field, the command is separated from previous
commands by a semicolon (;).
Responses
The device responds to serial commands with one of three responses:
ACK
ENQ
Indicates a good command which has been processed.
Indicates an invalid Tag or SubTag command.
NAK
Indicates the command was good, but the Data field entry was out of the
allowable range for this Tag and SubTag combination, e.g., an entry for a
minimum message length of 100 when the field will only accept 2 characters.
When responding, the device echoes back the command sequence with the status character
inserted directly before each of the punctuation marks (the period, exclamation point,
comma, or semicolon) in the command.