User manual

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