User manual

Publication AG-UM008C-EN-P - February 2005
8-14 Configuring Modems
Switch Settings
For Bell 202 full-duplex operating mode, set the switches on
Model
166-101 according to those in Table 8.10. For Bell 202
half-duplex operating mode (point-to-multipoint), set the switches on
Model
166-101 according to those is Table 8.11.
Table 8.10 Model 166-101 Full-Duplex Switch Settings
Table 8.11 Model 166-101 Half-Duplex Switch Settings
MARC Model 137-001
The MARC 137-001 module is an asynchronous frequency-shift keyed
(FSK) modem for use on leased lines or local twisted pairs. This
modem, which fits into a single slot of the Allen-Bradley 1771 I/O
chassis, features switch-selectable Bell and CCITT operating modes
and adjustable transmit levels.
To connect an Allen-Bradley PLC-5 processor to MARC Model
137-001, 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 xxx xxx off on on off on 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 xxx xxx on on on off on xxx
2 Transmit Level off on off off off off off off