Rockwell Automation 1770-HT8 SMART TRANSMITTER - Manual (Page 18)

Introducing the Smart Transmitter
Interface
Chapter 1
1-7
Half Duplex Communications
DF1 half duplex systems can be considerably more extensive. The host
computer can communicate via modems to a number of Smart Transmitter
Interfaces spread out over great distances. Once again, though
programmable controllers can certainly be a part of such a network, they
are not required, and any host with third party software can be used with
the Smart Transmitter Interface.
Figure 1.8
Half Duplex Communications with Modems
90048
HOST COMPUTER
MODEM
Half Duplex
ETC.
HART
Field
Devices
Smart
Transmitter
Interface
Smart
Transmitter
Interface
HART
Field
Devices