user manual

ND-20292
CHAPTER 2
APRIL, 1990
RS-232C MALE
RS-232C MALE
CONNECTOR
CONNECTOR
7 . SC
SG . 7
22 . RI
RI l 22
11 0
11
CABLE LENGTH: 50 feet (15 m) max.
CABLE TYPE: Twisted pair shielded RS-232C cross cable with RS-232C male
connectors on both ends.
NOTE:
The special null modem cable has pin 22 crossed to pin 11.
Figure 20054 Wiring Connections of RS-232C Cross Cable for Connecting a Modem to a DTA-E
(Rev. 1 only) Unit.
the AC/DC adaptor into the DTA-E Unit as
shown in Figure 200-44.
Dl. Installing keyboard dial/auto answer modems:
Use a modular ended line cord to connect the
modem to a vacant SLI-E( 1 ETU port that is
programmed for the same modem connection as
in Step A. Proceed to Step E.
D2. Installing non keyboard dial/auto answer
modems:
An Automatic Control Unit (ACU) interface
connector is provided with the modem. This
connector must be wired to the single line tip and
ring, and to the PWR relay contact of the DTA-E
Unit The interface connector is connected as
shown in Figures 200-54 and 200-55.
a. Remove the DTA-E Unit from the Multiline
Terminal being connected to the modem. Plug
in the PWR contact plug in the CN-2 socket
of the DTA-E Unit. Refer to Figure 200-56.
b. Connect the other end of the PWR cable (red
and white wires) to the TD (pin 5) and TDG
(pin 25) of the ACU interface female
connector provided with the modem.
E.
F.
G.
H.
I.
c. Connect the SLI tip and ring to be used for the
modem, to pins 7 and 8 of the ACU interface
female connector.
d. Plug the female ACU interface connector into
the male interface connector on the back of
the modem.
Set the baud rate of the modem to 300 or 1200, as
required. This setting must be set to the same
baud rate normally used by the distant modem
when using modem pooling.
Set up the necessary parameters of the modem;
(refer to the instructions provided with the
modem). If the modem is used for incoming
modem pool use, the modem auto answer mode
must be enabled.
Connect one end of a special null modem RS-
232C cross cable to the RS-232C connector of the
DTA-E Unit. Refer to Figures 200-54 and 200-55.
Secure the RS-232C connector with the screws
provided with the RS-232C cable.
Connect the other end of the RS-232C cable to the
modem, as described in the instructions provided
with the modem.
200 - 45