Continental Access SUPERTERM CIC1800, Installation And Service Manual, Page: 50 / 92

COMMUNICATION CONNECTION
Superterm CIC1800 / CICP1400UL 50
RS-422 to RS-422 MULTIDROP Network
Figure 33 shows the required connections for an
RS-422-toRS-422 MULTIDROP network.
Table 33 lists the necessary connections between:

A host computer and the first Superterm in the
network,
and

The first Superterm in the network and the
following Superterms (32 maximum) in a
network.
RS-422 to RS-422 MULTIDROP Drain
Wires
Ground the drain wires for all RS-422 cables in the
network to the Superterm ground posts.
NOTE: Connect all drain wires together starting
at the LAST Superterm in the network and working
toward the FIRST Superterm in the network.
Connect the drain wire from the FIRST Superterm
in the network to the drain wire at the Polling Line
Converter (see Figure 33).
Connect the drain wire from the Polling Line
Converter to the ground at the rear of the host
computer.
RS-422 to RS-422 MULTIDROP Jumper
Setting
Operating a Superterm network in the
MULTIDROP mode requires setting the MODE 1
and EOL2 jumpers.
Refer to page 70 for information regarding setting
the MODE I jumper.
Refer to page 66 for information regarding setting
the EOL2 jumper.
Table 33 - RS-422 to RS-422 MULTIDROP Network Connections
Host Computer Superterm #1 Superterm #2 Superterm 3# Superterm #4 Last Superterm
MODE1 jumper= MD MODE1 jumper= MD MODE1 jumper= MD MODE1 jumper= MD MODE1 jumper= MD
EOL2 jumper = OUT EOL2 jumper = OUT EOL2 jumper = OUT EOL2 jumper = OUT EOL2 jumper = IN
Signal Connector/Pin Connector/Pin Connector/Pin Connector/Pin Connector/Pin
RS-422 TXD+ POLL 13 (MD/R+) POLL 13 (MD/R+) POLL 13 (MD/R+) POLL 13 (MD/R+) >> POLL 13 (MD/R+)
RS-422 TXD- POLL 14 (MD/R-) POLL 14 (MD/R-) POLL 14 (MD/R-) POLL 14 (MD/R-) >> POLL 14 (MD/R-)
RS-422 RXD+ POLL 11 (MD/T+) POLL 11 (MD/T+) POLL 11 (MD/T+ POLL 11 (MD/T+) >> POLL 11 (MD/T+)
RS-422 RXD- POLL 12 (MD/T-) POLL 12 (MD/T-) POLL 12 (MD/T-) POLL 12 (MD/T-) >> POLL 12 (MDT-)