Common Diu Connections; Eia Interface Leads (Signals) - Toshiba Perfecptione Installation And Maintenance Manual

IMPORTANT NOTE!
To use the PDIU-DI or PDIU-DS with AT
commands, communications software or
some program that performs "terminal
emulation"must be loaded in the computer.
The AT commands cannot be issued from
the computer' s operating system prompt.
6.100 Common DIU Connections
6.101 The block diagram in Figure 4-51 illustrates
common DIU connections. In this example, PDIU-
Dls are connected to laptop personal computers
(PC1 and PC2), and the PDIU-DS' s 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 to send/receive
data to/from an external personal computer, or dial
up a data service.
6.102 To access these devices, a data call connec-
tion 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-Dls have
port and DATA DN assignments adjacent to the
digital telephones that they are connected to, while
PDIU-DS' s have separate port and DATA DN as-
signments. The
q
and m buttons on the digi-
tal telephone tell the system whether a voice or data
call is being made: The
q
button indicates voice
calls, and the m button indicates data calls.
When dialing from a keyboard with AT commands,
enter
ATD
for data calls. Only DATA calls can be
made through keyboard dialing.
6.103 Installation instructions for these devices are
provided in Paragraphs 6.140 w 6.160. Call paths
and scenarios for four types of data calls are
provided in Paragraphs6.181 m 6.185. Step-by-step
data calling procedures are provided in the PDlU
User Guide.
6.110 EIA interface Leads (Signals)
6.111 Both DIUs operate with the ten standard EIA
M-232 interface leads (signals) on which signal-
ing data is transmitted and received. DlUs connect
to serial data devices' signals with standard RS-
lNSTALLATlONlNSTRUCTlONS
SECTION 200-255-204
FEBRUARY1992
232 cables, available from telephone supply stores.
The PDIU-DVPDIU-DS Data Units require ten sig-
nals for some applications, but can function with
sight, using modular cords and connectors with
RJ45/DB25 adapters for other applications (Fig-
.rres 4-52 and 4-53). If uncertain which signals are
iecessary for an application, all ten should be
connected.
IMPORTANT NOTES.'
1. The PDIU-DI is always a DCE device;
the PDIU-DS may be a DTE or DCE,
depending on how its in ternal jumpers
(1 - 9) are configured (see Figure 4-54).
2. In the descriptions below, when a sig-
nal is ON, its potential is about seven
volts positive, relative to signal ground
(pin 7); when a signal is OFF, it is about
7 volts negative, relative to the signal
ground
(pin 7).
Frame Ground (FG, Pin 1):
The FG
signal (EIA circuit AA) is a protective or
safety ground which is bonded to the
PDIU-DVPDIU-DS. If required by local
codes, the FG may be connected to
external ground.
Transmit Data (TD, Pin
2): DTE devices
transmit, and DCE devices receive data
on theTD lead (EIA circuit BA). Before the
DTE device can transmit the TD signal,
the RTS, CTS, DSR, and DTR signals
(all discussed later in this section) must
be ON. The TD signal is
OFF
in the idle
state.
Receive Data (RD, Pin 3):
The DCE
device transmits data to the DTE device
on the RD lead (EIA circuit BB).
Request to Send (RTS, Pin
4): Some DTE
devices send an RTS signal (EIA circuit
CA) to the DCE device when they are
ready to transmit data on the TD lead. If
the DTE device generates the RTS signal,
the DIU DIP switch
SWI-4
should be set
to ON to inform the PDIU. Sometimes, the
DTUDCE device may use RTSKTS for
Ready/Busy-type flow control. In these
cases, DIP switch
SWl-4
should be set to
OFF
(see Figure 4-55 for the DIP switch
information).
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