Rockwell Automation 2755 Enhanced Decoder Series B - Manual (Page 219)

15–31 ASCII Host Commands
Publication 2755-833
OH - Hold Output Open/Closed
Command Format: OHnfftttt
Function: Allows the host to control the discrete outputs
(regardless of their ”normal” state) for a set
duration.
➀ When the duration expires, the output
reverts to its previous state.
Note: If a normally open output is held open (or
a normally closed output is held closed), the
state of the output will not change.
!
ATTENTION: An output held open or closed will
reestablish itself after a power loss (all other conditions
will be deactivated if power is lost). A Restart
command will deactivate a held output.
Parameters: nfftttt
Command
Parameters
Parameter Function Valid Values
n Discrete output number 1 through 8
ff
Hold switch operation in open
or closed state? 00= Hold Open ➀
11= Hold Close
tttt
Time (in milliseconds) that
output remains in held state.
When the time expires, the
output returns to its previous
state. 0000, 0010 to 9999
(milliseconds)
0000 holds output in
state until changed.
Response: = rr <end>
rr = response code
<end> = end of message control code
➀ A duration of 0000 holds the specified output in the programmed state until it is changed with
host command or via the AUX terminal configuration screens. The condition field on the AUX
will display Open or Closed.