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INSTALLATION INSTRUCTIONS
SECTION 200-255-204
FEBRUARY1992
5.87 Switches 2,3, and 4 select the data speed for
synchronous transmission only.
Switch 2 = 2400 bps
Switch 3 = 4800 bps
Switch 4 = 9600 bps
5.88 If asynchronous operation is used, the
switches will have no effect and the data speed will
self-adjust to a maximum speed of 19.2 kbps or
less.
5.89 A power ON/OFFswitch that appears on some
early DDIU-MAT models controls power to the
DDIU-MAT from the power supply. If the switch is
OFF, the DDIU-MAT will not function, but the elec-
tronic telephone will continue functioning normally.
When the switch is ON, both DDIU-MAT and elec-
tronic telephone are functional. In later models, the
DDIU-MAT is operational when the power supply is
plugged in.
/MPORTANT!
All connections
to DDlUs (-MA or -MAT)
must observe correct tip and ring polarity
for proper operation.
5.90 DDIU-MA
5.91 The DDIU-MA is a stand-alone unit that incor-
porates both the manual dialing and auto-answer-
ing features of the DDIU-MAT, but is used as a data
transceiver only.
5.92 The DDIU-MA has several internal and ex-
ternal switches that must be set for proper opera-
tion.
5.93 The power ON/OFF switch, on the bottom of
the DDIU-MA, must be turned ON for the DDIU-MA
to operate. When the switch is ON, an LED on the
front faceplate will light.
5.94 The DDIU-MA' s faceplate must be removed
to set the internal DIP switches. Remove the face-
plate by carefully lifting the lower right corner and
then pulling the faceplate away from the base. Set
the following parameters as required at switch S26
on the internal DIUA PCB (Figure 4-40):
Switch 1* = Equipment Ready Supervision
ON-Data device provides an Equip-
ment Ready signal to the DDIU (the
Terminal Ready LED will light only
when the signal is received).
OFF-Data device does not provide an
Equipment Ready signal to the DDIU
(the Terminal Ready LED will remain
lit continuously).
Switch 2 = not used.
Switch 3 = not used.
Switch 4 = ON (Enables automatic answer mode of
operation.)
Switch 5 = ON (Activates Automatic Data Release
feature. The data connection is auto-
matically released if no data is transmit-
ted for a period of 18 minutes.)
Switch 6 = 2400 BPS **
Switch 7 = 4800 BPS **
Switch 8 = 9600 BPS **
*A data path cannot be established if the
Terminal Ready light is OFF (even though a
DDIU-MA can be answered manually). The
Terminal Ready light must be ON to establish
a data path when answering manually.
**Select the appropriate speed for synchro-
nous data transmission. If the asynchronous
mode of operation is used, these switches,
have no effectand the DDIU-MA willautomati-
tally adjust to the appropriate speed (to a
maximum of 19.2 kbps).
5.95 Two switches on the DIUB PCB must be set
for either DTE or MODEM (DCE) operation. The pin
assignments shown in Paragraph 5.83 explain the
RS-232C cable signaling differences between DTE
and DCE devices. (Typically, a DTE is a terminal
device such as a personal computer or printer,
while a DCE is an intermediate device such as a
modem or protocol converter connected to a host.
Refer to the data device manufacturer' s documen-
tation for its signaling information.) Set the DIUB
PCB switches as follows:
1) Loosen the two screws found under the DDIU-
MA' s faceplate on the right side (top and
bottom) of the DIUA PCB (Figure 4-40).
4-30
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