Marc model 148-001 -16 – Rockwell Automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM User Manual
Page 282
Publication AG-UM008C-EN-P - February 2005
8-16 Configuring Modems
Table 8.13 Model 137-001 Full-Duplex Switch Settings
Table 8.14 Model 137-001 Half-Duplex Switch Settings
MARC Model 148-001
The MARC 148-001 comprises two 137-001 modems in a single
package. You can operate the modems independently or in a
redundant mode. This model fits into a single slot of the Allen-Bradley
1771 I/O chassis and features switch-selectable Bell and CCITT
operating modes and adjustable transmit levels.
To connect an Allen-Bradley PLC-5 processor to MARC
Model 148-001, follow these specifications for:
•
cable pin assignments
•
switch settings
ATTENTION
Switch settings shown here are for modems using
RJ11 plugs on 4-wire lines. If you are using 2-wire
lines, consult the MARC user manual.
Switch Assembly
1
2
3
4
5
6
7
8
1 Operating Mode
off
on
on
off
on
xxx
xxx
xxx
2 Transmit Level
off
on
off
off
off
off
off
off
Switch Assembly
1
2
3
4
5
6
7
8
1 Operating Mode
on
on
on
off
on
xxx
xxx
xxx
2 Transmit Level
off
on
off
off
off
off
off
off