Emerson DL8000 - Initialize Transaction Storage (0 X20); Start Communication (0 X21)

DL8000 Preset Instruction Manual
D-56 Communications Protocols Revised February-2016
Initialize Transaction
Storage
[0x20]
Exceptions
 Transaction in Progress
 Transaction history module is not running in
preset
Supporting
Parameters
None
Results
Transaction storage initialization may take several
seconds to complete. This command does not
modify the rolling four-digit transaction and batch
sequence numbers.
Deviations
None
Start Communication
[0x21]
Initiates communication between the TAS and the DL8000. When the DL8000
has experienced:
 Powered-up/reset
 Program mode exit
 Communication failure alarm reset.
The TAS can start or initiate communication with the DL8000 using this
command. If communications are already started when this command is
received, then the communication link is re-initialized but operations at the
DL8000 are unaffected. The command resets the alternating function code
sequence, using function codes 41h or 42h for the query. The next (non-retry)
query from the TAS should use the other function code (that is, if 41h initiates
the query, 42h should be the next non-retry query).
Under the DanLoad 6000 protocol, until communications are established
using this command, the DL8000 accepts no other command.
Operation of DL8000 remains unaffected by Start Communication command.
Flags Immediately Set
None
Flags Immediately
Cleared
None
Exceptions
None
Supporting
Parameters
None
Results
The command response frame consists of the
following parameters:
 Number of meters [63,0,20]
 Number of components [63,0,21]
 Number of valves [63,0,19]
 Number of factors or flow rate [63,0,109]
 Number of recipes [63,0,26]
 Number of additives [63,0,100]
 Temperature Units Option [70,0,2]
 Temperature correction option [71,x,28]
 Pressure correction option [71,x,29]