
PLX51-HART-4I / PLX51-HART-4O
♦
HART Input/Output
Operation
Multidrop Field Devices
User Manual
ProSoft Technology, Inc.
Page 65 of 127
Below is the description of the various parameters in the UDT.
Table 4.12 – Custom HART command UDT Parameters
Parameter
Description
MsgTrigger
This is the trigger to start the execution of the custom HART command.
When this parameter is set to 1 it will start sending the custom HART
message. Once complete this parameter will automatically be cleared
back to zero.
Status
Once the custom HART message transaction has completed, it will update
the status field in the UDT to indicate the status of the transaction.
0 – Success
1 – Response Timeout
2 – HART device offline
3 – No Multidrop Device configured
ReqDataLen
This parameter indicate the number of bytes to be sent in the custom
HART command. If this parameter is made zero, then no additional HART
data will be sent other than the HART command.
ReqData
The ReqData parameter is a SINT array allowing for up to 64 bytes to be
sent.
Note
: It is the user’s responsibility to ensure that the data to be sent is in the correct format
based on the HART command.
ResDataLen
This parameter indicate the number of bytes received from the custom
HART command. If this parameter is made zero, then no HART data was
received.
ResData
The ResData parameter is a SINT array allowing for up to 64 bytes to be
returned.
4.2