Toshiba Strata DK 24, Руководство по установке и обслуживанию

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8-43
INSTALLATION-PERIPHERALS
SECTION 400-096-208
SEPTEMBER 1992
11.03 Alarm Sensor Wiring. Refer to Figure
8-27, and connect the facility alarm system relay
contacts to the PIOU/PIOUS PCB.
12 DATA INTERFACE UNIT
INSTALLATION (RELEASE 3 AND
HIGHER)
12.00 General
12.01 Releases 3 and 4 provide two types of data
interface units (DIUs) that enable digital telephone
users to simultaneously transmit and receive data
on the same PDKU station port and wire pair while
communicating on a voice call. One unit, called the
Integrated DIU (PDIU-DI), becomes part of the
digital telephone, replacing the telephone’s base;
the other unit, is a small self-contained unit called
the Stand-alone DIU (PDIU-DS). Each DIU is pow-
ered by the PDKU it is connected to; therefore, no
external power is required.
NOTE:
2000-series Digital Telephones require a
PDIU-DI2 and 1000-series Digital Telephones
require a PDIU-DI.
12.02 Both DIUs can be connected to standard
Electronic Industries Association (EIA) RS-232
asynchronous serial data devices. EIA devices are
divided into two categories: data communication
equipment (DCE) and data terminal equipment
(DTE). Common DCE devices are modems and
some printers; common DTE devices are personal
computers, ASCII terminals, and some printers.
The PDIU-DI operates like a DCE and connects
directly to DTE devices using standard RS-232
cables. Depending on how its internal jumper plugs
are configured, the PDIU-DS can either operate
like a DTE and connect to DCE devices; or operate
like a DCE device and connect to a DTE device. In
most applications, DTE and DCE devices exchange
data between each other via the standard RS-232
cable connection.
12.03 DIUs can function with DCE and DTE de-
vices at data speeds of up to 19.2 kbps. However,
keyboard dialing using AT commands (from a PC
or terminal connected to a DIU) is limited to 9600
bps. A speed of 19.2kbps can be achieved when
dialing from a PDIU-DI-equipped digital telephone
dialpad, but take note that many PC software
programs and UART, RS-232 communication ports
do not reliably operate at 19.2 kbps. DIU data
transmisssion speed is set by the first AT command
that the DIU receives once it is in the command
state; if manual dialing or receiving calls in the auto
answer (default) mode, the transmission speed is
transparent.
IMPORTANT NOTE!
To use the PDIU-DI or PDIU-DS with AT
commands, communications software or
a PC program that performs terminal emu-
lation must be used. AT commands can-
not be issued from the computer’s operat-
ing system prompt.
12.10 Common DIU Connections
12.11 The block diagram in Figure 8-28 illustrates
common DIU connections. In this example, PDIU-
DIs are connected to personal computers (PC1 and
PC2), and PDIU-DSs are connected to a serial
printer and modems. The PC users can transfer
files internally, print files on the same printer, and
access the modem pool to send/receive data to/
from an external PC or dial up data service.
12.12 To access these devices, a data call con-
nection must be established between the DIUs.
This is accomplished by dialing the destination DIU
from a digital telephone dialpad or from a PC
keyboard using standard AT dial commands. PDIU-
DIs share the same intercom numbers/ports with
the digital telephone to which they are connected,
while PDIU-DSs have their own. The Intercom
(INT) and Data Call (DATA) LEDs on the digital
telephone tell the system whether a voice or data
call is being made: the Intercom (INT) LED indi-
cates voice calls; and the Data Call (DATA) LED
indicates data calls. When dialing from a keyboard
with AT commands,
A T D is typed for voice calls,
and A T D D for data calls.
12.13 Installation instructions for these devices
are provided in Paragraphs 12.40 thru 12.70. Call
paths and scenarios for five types of data test calls
are provided in Paragraphs 12.82 ~ 12.86. Step-