Continental Access SUPERTERM CIC1800, Installation And Service Manual, Page: 46 / 92

COMMUNICATION CONNECTION
Superterm CIC1800 / CICP1400UL 46
RS-232 to RS-422 MULTIDROP Network
Figure 31 shows the required connections for an
RS-232 to RS-422 MULTIDROP network.

Connect the first Superterm to the RS-232 port
of the host computer.

Connect the remainder of the network using the
Superterm's RS-422 ports.
Table 31 lists the required connections for an RS-
232 to RS422 MULTIDROP network.
RS-232 to RS-422 MULTIDROP Drain
Wires
The drain wires for all RS-422 cables in a
MULTIDROP network must be connected together
(isolated from the boards) and connected to the
ground post at the FIRST Superterm in the network
(the Superterm unit CLOSEST to the host
computer).
RS-232 to RS-422 MUTIDROP 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 MODE1 jumper.
Refer to page 66 for information regarding setting
the EOL2 jumper.
Table 31- RS-232 to RS-422 MULTIDROP Network Connections
Host Computer Superterm #1 Superterm #2 Superterm 3# Last Superterm
MODE1 jumper = RPT
EOL2 jumper = IN
MODE1 jumper = MD
EOL2 jumper = OUT
MODEL jumper = MD
EOL2 jumper = OUT
MODE1 jumper = MD
EOL2 jumper = IN
Signal Connector/Pin Connector/Pin Connector/Pin Connector/Pin
RS-232 RXD
RS-232 TXD
RS-232 GND POLL 4 (TXD)
POLL 5 (RXD)
POLL 6 (GND)
POLL 7 (RPT/T+)
POLL 8 (RPT/T-)
POLL 9 (RPT/R+)
POLL 10 (RPT/R-) POLL 13 (MD/R+)
POLL 14 (MD/R-)
POLL 11 (MD/T+)
POLL 12 (MD/T-) POLL 13 (MD/R+)
POLL 14 (MD/R-)
POLL 11(MD/T+
POLL 12 (MD/T-) >> POLL 13 (MD/R+)
>> POLL 14 (MD/R-)
>> POLL 11 (MD/T+)
>> POLL 12 (MD/T-)