Rockwell Automation 1770,D17706.5.21 SMART TRANSMITTER TOOLKI User Manual
Page 12
Chapter 1
Introducing The Smart Transmitter Toolkit
1-5
The PLC-5 processor sends and receives data from the 1770-HT1 as Smart
Transmitter Interface Packets. The HART field device sends and receives
data from the 1770-HT1 as HART packets. The 1770-HT1 converts the
packets that it receives to the required format before transmitting the
packets to their destination.
This diagram illustrates the relationship between the two packets.
90066
HART Command
Byte Count
Data
Check Byte
Address
Delimiter
Parameter
Control
Channel Number
Smart Transmitter Interface Command
Preamble
Smart Transmitter
Interface packet
HART
packet
Using a few pieces of data, the STT subroutine creates a Smart Transmitter
Interface packet and sends it to the 1770-HT1. The STT subroutine then
takes the response from the 1770-HT1 and decodes the Smart Transmitter
Interface packet to provide you with useful data.
For more information about communications with Smart Transmitter
Interface products, see the Smart Transmitter Interface Products (HART
Protocol) User Manual, publication 1770-6.5.19.
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