Dip Switch Options; Rpci-Di And Pdiu-Di To Personal Computer (Pc) Installation - Toshiba Strata DK 280 Installation Manual

Data Terminal Ready (DTR, Pin 20)
The DTE device sends the DTR signal (EIA circuit CD)
to the DCE device, prompting the DCE device to open
the communication line. The line is closed and the call
disconnected when the DTE device quits sending the
DTR signal. DTR may be sent any time to indicate that
the DTE is ready to transmit or receive data. DIP
switch SWl-2 should be set OFF in most cases (see
Figure 6-33 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 RPCI or DIU dip switch SWl-3 is set
ON, the RI signal will be continuously ON if ringing; if
the switch is set OFF, the RI signal will be one second
ON/three seconds OFF when the RPCI or DIU detects
ringing signal.
6.9.3 DIP Switch Options
The RPCI-DI, 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 6-33).
SWl-1
Normally this switch is set ON to disconnect devices
from RPCls or DlUs automatically. The connection is
maintained if data is exchanged between the device
and the RPCI or DIU within eight to nine minute
intervals. If SWl-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
RPCI-DI or PDIU-DI (or PDIU-DS configured like a
DCE) must hold DCD and DSR ON continuously. If
SWI-2 is OFF, DSR follows DTR and DCD will be ON
only when the DIU is connected on a data call to
another DIU. SWl-2 should be OFF on a RPCI DIU
when it is connected to a personal computer that uses
a communications software program to establish data
calls with AT commands; and whenever PDIU-DS is
connected to a modem.
SW1 -3
The RPCI-DI or 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 RPCI or
PDIU is receiving an incoming call. SWl-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 or when
connected to a modem that tracks the DCD signal
(modem set with AT&Cl). Sometimes, the DTE device
may use RTS/CTS for Ready/Busy flow control, in
these cases SWI-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 RPCl's or DIU's DCD signal.
Consult the DTE device or application software
documentation to determine which type of flow control
is required. If the DIU-DS is connected to a modem
that tracks carrier detect (AT&Cl) SWI-4 should be
ON.
6.9.4 RPCI-DI and PDIU-DI to Personal
Computer (PC) Installation
The RPCI-DI and 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 RPCI-DI or 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 RPCI-DI or PDIU-
DI.
2. The RPCI-DI or PDIU-DI can connect to a
DCE computer or any other DCE-type
device using a specially configured RS-
232 cable or adapter; but this application
is rarely required.
1. Install the digital telephone that is to be equipped
with RPCI-DI or PDIU-DI per the instructions in
Chapter 5-Station Apparatus and the drawing in
Chapter 7-Wiring Diagrams.
2. Install the RPCI-DI or PDIU-DI under the digital
telephone per the instructions in Chapter 5-
Station Apparatus. *
6-40
January 1996