VICI SVI - Manual (Page 12)

8
Communicating with the SVI using Vcom
Transmitted Command Types
The following is a list of the command letters for the types of commands
available for controlling the SVI. Each letter represents a specific function
the SVI will perform. The commands are sub-divided into two groups:
commands directed to specific valves, and commands directed to the SVI.
Commands for Specific Valves
V Indicates a Valve positional command. It is used to direct the SVI to
move a valve to an indicated position.
S Indicates a valve Status request. It tells the SVI to transmit the current
position of the indicated valve to the host.
L Indicates a valve command to Limit the number of positions to which the
SVI will rotate a multiposition valve.
F Indicates a command to check valve status after a positioning command
is completed and to provide Feedback as to the functional success or
failure of the command.
N Indicates a command to igNore valve status after the execution of a valve
positioning command.
Commands for the SVI
R Represents a command to the SVI to Reset, or perform a re-initialization
of the device. It is equivalent to turning the power off and back on again.
E Represents an Echo control command to the SVI. The echoing of
position arrival (closed loop feedback) of all valves on an SVI can be
deactivated or reactivated using this command.
/? Causes a command list to be echoed to the serial port.
Transmitted Command Syntax
For the purpose of learning the transmitted command syntax, it is easier to
consider only SVIs in the single device mode. It is also helpful to divide the
commands into three groups: commands with a command letter, a valve
number, and a valve position (three variables); commands with a command
letter and a valve number (two variables); and commands with fixed syntax
(no variables).
No spaces are allowed between any portion of a single
command.
Command Letter/Valve Number/Position
In these commands, valve numbers 1 through 6 are used, depending on the
valve to be addressed. For two position valves (1 through 4), the position
variables are A and B. (L for Load and I for inject may be substituted for A
and B, but this creates the potential for confusion between Limit and Load.)