Rockwell Automation 2708-DH5B2L_DH5B4L Attended Workstation - Manual (Page 79)

Chapter 8
Host Communications
8–4
Requests may be sent through the network to perform various command
functions on the workstation.
These requests constitute a valid “poll”. For workstations which are currently
using polled mode, any available record will be forwarded to the Host after
receipt of one of these network directives. Your Host software must be able
to handle any data records which are transmitted during the course of
network directives transmissions.
The following is a list of the network directives, with a one-line description
of what each does. Details on each individual network directive follow the
list.
These commands are of two principle types:
1. Requests for information
2. Commands
The way you can distinguish between these two types is by observing which
way the arrow (bracket) points in the command.
< is a request for information
> is a command
The directives which start with a left angle bracket request information from
the workstation.
< D shows contents of front panel display
< E shows last language error message
< R shows last RESET error message
< S
shows serial number and other status
< T shows date and time as set on workstation
< V shows firmware version and description
10-3:<V
This request is made to workstation 3 attached to master 10. The directive
<V asks to return the firmware version and description. Directives preface
with a left arrow (<) identifies a request for information. Right arrow
directives (>) indicate a command that requires an action. If the colon (:) is
replaced by an equal sign (=) then all subsequent transfers will take place on
the specified workstation. For example, if 10-3 = is entered, all directives
will only act on this workstation until another workstation number is
specified.
Network Directives