Toshiba Strata DK 24, Installation And Maintenance Manual

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8-52
INSTALLATION-PERIPHERALS
SECTION 400-096-208
SEPTEMBER 1992
transmit or receive data. DIP switch SW1-2 should
be set OFF in most cases (see Figure 8-36 for
DIP switch information).
•
Ring Indicator (RI, Pin 22): The RI signal (EIA
circuit CE) is sent by the DCE device to the DTE
device. Whenever the DCE device receives a
ringing signal on the line side, it turns the RI
signal ON. If DIU DIP switch SW1-3 is set ON,
the RI signal will be on continuously if ringing; if
the switch is set OFF, the RI signal will be one
second ON/three seconds OFF when the DIU
detects ringing signal.
12.30 DIP Switch Options
12.31 The PDIU-DI and the PDIU-DS each have a
four-control DIP switch which can be configured for
signaling options. The switch is located on the
bottom of the PDIU-DI, and on the back panel of the
PDIU-DS (see Figure 8-35).
•
SW1-1: Normally this switch is set ON to discon-
nect devices from DIUs automatically. The con-
nection is maintained if data is exchanged be-
tween the device and the DIU within eight to nine
second intervals. If SW1-1 is OFF on the called
and calling DIU, data calls will remain connected
until released manually.
•
SW1-2: This switch is placed in the ON position
when the PDIU-DI (or PDIU-DS configured like a
DCE) must hold DCD and DSR ON continu-
ously. If SW1-2 is OFF, DSR follows DTR and
DCD will be ON only when the DIU is connected
on a data call to another DIU. SW1-2 should be
OFF on a DIU when it is connected to a personal
computer that uses a communications software
program to establish data calls with AT com-
mands.
•
SW1-3: The PDIU-DI (or PDIU-DS configured as
a DCE) sends the Ring Indicate (RI) signal to the
computer to tell the computer (DTE) that the DIU
is receiving an incoming call. SW1-3 should be
ON for the DIU to send RI steady, and OFF to
send at one second ON/three seconds OFF
intervals.
•
SW1-4: This switch is placed in the ON position
if the computer does not output the RTS signal.
Sometimes, the DTE device may use RTS/CTS
for Ready/Busy flow control, in these cases
SW1-4 should be OFF. In this case, the DCD
signal of the calling DTE is used as the RTS lead
of the called DTE and the DCD signal of the
called DTE is used as the RTS signal of the other
DTE. In this case a signal which stops the DTE
from transmitting data (usually the CTS lead)
should be cross-connected to the DIU's DCD
signal. Consult the DTE device or application
software documentation to determine which type
of flow control is required.
12.40 PDIU-DI to Personal Computer (PC)
Installation
12.41 The PDIU-DI always functions as a DCE
device; it transmits data on the Receive Data lead
(RD) and receives data on the Transmit Data lead
(TD). Most personal computers function as a DTE
device; PCs transmit data on the TD lead and
receive data on the RD lead. Follow the steps below
to install the PDIU-DI to a DTE, PC:
NOTES:
1. Use the steps below when installing an
ASCII terminal, personal computer, or any
other DTE device to a PDIU-DI.
2. These instructions apply to both the PDIU-
DI2 (which connects to 2000-series Digital
Telephones only) and to the PDIU-
DI(which connects to 1000-series Digital
Telephones only).
3. The PDIU-DI can connect to a DCE com-
puter or any other DCE-type device using
a specially configured RS-232 cable or
adapter; but this application is rarely
required.
1) Install the PDIU-DI under the digital telephone
per the instructions in Section 400-096-207.
2) Install the digital telephone that is to be
equipped with the PDIU-DI per the applicable
drawing in Section 400-096-209.
NOTES:
1. The PDIU-DI always operates as a DCE
device; therefore, unlike the PDIU-DS, it
has no internal jumpers for DCE/DTE con-
figuration.