Rockwell Automation 1770-HT8 SMART TRANSMITTER - Manual (Page 69)

Communicating with the Smart
Transmitter Interface
Chapter 4
Communicating with the Smart Transmitter
Interface
4-4
Table 4.A summarizes the definitions of relevant communications terms
used with the Smart Transmitter Interface.
Table 4.A
Definitions of Communications Terms
Term Definition
Block Transfer Read
(BTR)
A programmable controller ladder logic instruction to obtain data
(formatted as Smart Transmitter Interface packets) from the Smart
Transmitter Interface over the RIO link.
Block Transfer Write
(BTW)
A programmable controller ladder logic instruction to send data
(formatted as Smart Transmitter Interface packets) to the Smart
Transmitter Interface over the RIO link.
Burst Data Table An internal table maintained by the Smart Transmitter Interface which
stores the latest HART Burst Data received on a monitored channel.
DF1 Protocol An AllenĆBradley proprietary protocol which defines the format of data
packets transmitted over an RSĆ232C link.
DF1 Packet A data packet formatted according to the DF1 protocol.
DF1 Command A DF1 packet transmitted by a host computer to the Smart Transmitter
Interface.
DF1 Response A DF1 packet transmitted by the Smart Transmitter Interface to a host
computer.
HART Protocol A communications protocol defining the format of data packets
transmitted between the Smart Transmitter Interface and HART field
devices.
HART Packet A data packet formatted according to the HART Protocol.
HART Poll A HART Packet sent by the Smart Transmitter Interface to a field
device to poll or write data to it.
HART Response A HART Packet sent by the field device to the Smart Transmitter
Interface in response to a HART Poll.
HART Burst Data An unsolicited HART Packet sent periodically by a field device to the
Smart Transmitter Interface.
Smart Transmitter
Interface Protocol
A communications protocol defining the format of data packets
transmitted between a programmable controller and the Smart
Transmitter Interface.
Smart Transmitter
Interface Packet
Data packets formatted according to the Smart Transmitter Interface
Protocol.
Frame Frame is another word for packet used extensively in Rosemount
HART documentation.
Definition of Terms