TriContinent C24000, Product Manual

Page: 39 / 144

Command guidelines
39
C-Series Product Manual
Command execution guidelines
To enter commands properly, keep the following in mind:
• Commands are case-sensitive.
• All commands, except report commands and most control commands, must
be followed by an [R] (Run or Execute) command.
• Single or multiple commands can be sent to the pump within a string.
For example:
–
A single command such as [A3000R] moves the plunger to position
3000.
–
A multi-command string such a [IA3000OA0R] moves the valve to the
Input position [I], moves the plunger to position 3000 [A3000], turns
the valve to the output position [O], and finally returns the plunger to
position 0 [A0].
• The pump's command buffer holds a maximum of 255 characters.
• Once a command is in the process of being executed, the pump is busy and
will not accept new commands until the sequence is completed. If a new
command is issued while the pump is busy, a command overflow error code
will be issued and the command string will be ignored. Exceptions to this rule
include the [T] (terminate), [V] (top velocity), and most report commands.
The busy/idle status is determined by polling the pump with the [Q] com-
mand.
• When a command is sent, the pump answers immediately (except in multi-
address mode).
• If an invalid command is sent within a command string, the pump reports an
error immediately. The error codes are described in "Status and error codes"
(page 85). If there was an invalid parameter, in certain cases the string will
execute until the invalid parameter is reached and then stop. In all cases, the
[Q] (query) command is used to read back the error.
Execution controls
Command strings may contain controls which modify command execution.
Examples are the [R] command, halt and wait for an external signal [H], and
commands that initiate loops (repeat sequences) [g] [G]. For details on
these commands, refer to "Execution control commands" (page 71).