Rockwell Automation 2755 Enhanced Decoder Series B - Manual (Page 168)

12–6 Configuration: Host Communications
Publication 2755-833
Large Buffer
Field Type Options
Select
Yes
No
Enables or disables use of the 8K byte buffer on the HOST port. The
default is No, which disables use of this buffer.
The 8K byte buffer allows the decoder to decode and buffer
messages to the host. This feature is useful for applications where the
host is incapable of handling high burst rates of data from the
decoder. If No is selected, the decoder will only buffer one message.
!
ATTENTION: Do not use the large buffer if the data
sent to the host must be coordinated with the output
modules, because the buffering may delay receipt of
the data by the host.
Send Message to Host
Field Type Options
Select
At End of Trigger
Immediately After
Valid Package
Specifies when the decoder sends data to the host or activates an
output module. The default is At End of Trigger.
The end of trigger condition is determined by the decode mode. The
end of trigger conditions for the triggered decode modes are:
Timing Host Package Detect Internal Timer
End of Trigger
(send message to
o t
Stop scan character Detect signal goes
inactive
nd a to
host
at end of trigger)
No-read timer ex-
pires No-read timer ex-
pires No-read timer ex-
pires
Immediately After
Valid Package Symbols/package
count met Symbols/package
count met Symbols/package
count met
The response mode for the continuous and continuous/unique decode
modes is always Immediately After Valid Package. The decoder
sends data and activates the outputs immediately after a valid
package (symbols/package count is met) or a no-read, whichever
comes first. Use this mode for maximum speed.