Rockwell Automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM - Manual (Page 271)

Publication AG-UM008C-EN-P - February 2005
Configuring Modems 8-5
DATA-LINC Group DATA-LINC GROUP supplies telephone modems compatible with
Allen-Bradley processors. The modems provide long-distance
communication over leased lines or standard dial-up lines.
Follow these guidelines for connecting an Allen-Bradley processor to
these models of DATA-LINC telephone modems. Use the table below
to choose the appropriate model for your application.
Table 8.2 DATA-LINC Modem Types
DATA-LINC modems are pre-configured at the factory for each
application, and no modem field settings, programming or adapters
are required.
DLM4300
The DATA-LINC DLM4300 Digital Leased Line Modem is a pollable,
multi-drop, multi-point modem for connection to telco 56K digital
leased lines, know as DDS. The DLM4300 connects to all
Allen-Bradley PLCs and supports asynchronous serial data with
selectable data rates from 1200 to 38.4K baud. Remote modem
response is accomplished by either RTS line control or DATA-LINC’s
proprietary Data Sense Carrier Control. The DLM4300 employs high
level error control and full digital leased line conditioning. Range on
properly conditioned leased lines is unlimited. The DLM4300 is
Link
Type
Transmission
Rate Topology Modem Model See page
digital
leased-line
57,600 point-to-point
point-to-multipoint
DLM4300
(1)
(1) 1746 and 1771 rack mount available
8-5
analog
leased-line
1200 (4- wire) point-to-multipoint LLM1000-4 (1) 8-6
1200 (4-wire) point-to-point
analog
leased-line
1200 (2-wire) point-to-multipoint LLM1000-2 (1) 8-6
dial-up or
analog
leased-line
28,800 (2-wire) point-to-point DLM4000 8-9
dial-up 28,800 point-to-point DLM4100-SLC 8-10
dial-up 28,800 point-to-point DLM4100-PLC 8-10
TIP
For additional modem specifications consult your
DATA-LINC user manual or www.data-linc.com.