Allen-Bradley 1746-BAS, User Manual, Page: 33 / 84

Publication 1764-UM001A-US-P
Component Selection 2-7
Figure 2.5 DF1 Communication Interface
Leased Phone Line
A leased phone line is a private, dedicated phone line. Leased phone lines provide a
phone link between modems that is available for communication at all times.
Typically, leased phone lines are used when you have a high or constant transfer of
communication between the module and external devices.
Radio Link
A radio link provides a communication link when phone lines are inaccessible or
expensive to use. A radio link provides a communications link between radio
modems.
Dial-Up Modem
Dial-up or phone modems are modems capable of communicating across standard
phone lines. One dial-up modem initiates the communication, while another
modem receives the communication.
(1) The 1747-KE module can be replaced by the 1770-KF3 DH485 Communication Interface Module, a stand-alone version of the KE module.
DH485 Communication
Cable (Belden™ 9842)
Personal Computer with BASIC
Development Software
(1747-PBASE)
SLC 500 Controller
with 1747-KE
Module
(1)
Interface/Converter
RS-232 to RS-485 Catalog
Number 1747-PIC
SLC 500
Controller
Link Coupler
1747-AIC
Modem
1747-C11 Cable
1747-C13 Cable
SLC 500 Controller
with BASIC or
BASIC-T Module
1747-C11 Cable
Link Coupler
1747-AIC
Modem
Spare Allen-Bradley Parts