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HART Program User Manual
Secondary Value — The Secondary Value as read from the device. The Secondary Value is setup in
the HART device and cannot be altered from the ROC.
Secondary Units — The units configured in the HART device for the Secondary Value.
Tertiary Value — The third value as read from the device. The Tertiary Value is setup in the HART
device and cannot be altered from the ROC.
Tertiary Units — The units configured in the HART device for the Tertiary Value.
4th Value — The 4th Value as read from the HART device. The 4th Value is setup in the HART device
and cannot be altered from the ROC.
4th Units — The units configured in the HART device for the 4th Value.
Communications — The current status of the Communications.
♦ Communication Error – A communications error occurred during transmission.
♦ L Parity Error – The Longitudinal Parity calculated by the device did not match the
Longitudinal Parity byte at the end of the message.
♦ V Parity Error – Vertical Parity error. The parity of one or more of the bytes received by
the HART device was incorrect.
♦ Reserved – Reserved.
♦ Overrun Error – At least one byte of data in the receive buffer of the HART device was
overwritten before it was read.
♦ Buffer Overflow – The message was too long for the receive buffer of the HART device.
♦ Framing Error – The Stop Bit of one or more bytes received by the HART device was not
detected.
♦ Undefined – Unknown error.
Command Response — This read-only field indicates the current Command Response received from
the Slave. Refer to the specific HART device manual for further information about the error
and Command Response summaries. A brief overview of the errors that may be received is
provided in Table 5-1.
Table 5-1. Command Response Errors
0
1
2
3
Rev 3/99
Command Response
No Command specific error
Undefined
Invalid selection
Passed parameter too large
5-3