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Marc model 148-001 -16 – Rockwell Automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM User Manual

Page 282

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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