Common Diu Connections - Toshiba Strata DK 280 Installation Manual

Data Communication mode. The RCPI operating
mode is controlled by the PC connected to the RPCI-
DI. Section 6.9 only covers the RCPI-DI data
communications mode. The RCPI-DI Operating
Instructions and User Guide provides RPCI-DI mode
changing information
Notes:
1. "Digital Ports" include the DK280, PDKU
and RDSU digital station ports. This
applies wherever the term "Digital Ports"
is used in the text and figures in this
chapter.
2. 2000-series digital telephones require
RPCI-DI or PDIU-D12 and lOOO-series
telephones require PDIU-DI and are not
compatible with RPCI-DI or PDIU-D12.
Both RPCls and DlUs 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
RPCI-DI and PDIU-DI operate 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.
When in the data communications modes, RPCls and
DlUs can function with DCE and DTE devices at data
speeds of up to 19.2 kbps. However, keyboard dialing
using AT commands (from a PC or terminal connected
to a RPCI or DIU) is limited to 9600 bps. A speed of
19.2 kbps can be achieved when dialing from a RPCI-
DI or PDIU-DI equipped digital telephone dialpad, but
many PC software programs do not yet handle 19.2
kbps in an error-free manner. Also for a 19.2 kbps
operation the computer or terminal's COM port must
be specified to function at 19.2 kbps. Some computer
COM ports, like those used in older IBM XT type
computers (25pin RS-232), will not operate at 19.2
without errors. RPCI or DIU data transmission speed
is set by the first AT command that the RPCI or 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!
To use the RPCI-DI, PDIU-DI or PDIU-DS
with AT commands, communications software
or a PC program that performs terminal
emulation must be used. AT commands
cannot be issued from the computer's
operating sys tern prompt.
RPCI-DI Dual Mode
RPCI-DI can operate in the data communication or
Telephone Application Program Interface (TAPI)
mode.
n When in the TAPI mode, send the HEX
(fa),
decimal 240 (or the = ASCII character) to the
RPCI to switch it to the Data Communications
mode. (Unplugging the telephone cord and then
reconnecting it also resets the RPCI to the Data
Communications mode.)
n When in the Data Communications mode, send
(ATCB) to the RPCI to switch it to the TAPI mode.
In the TAPI mode, a constant stream of data is
sent from the RPCI to the PC COM port.
n RPCI-DI mode switching should be performed
automatically by the application programs running
on the PC connected to the RPCI-DI.
(See Section 6.14 for instructions on configuring your
PC for TAPI software.)
6.9.1 Common DIU Connections
The block diagram in Figure 6-25 illustrates common
RPCI and DIU data communications connections. In
this example, RPCI-Dls or PDIU-Dls are connected to
personal computers (PC1 and PC2), and PDIU-DSs
are connected to a serial printer and modems. The
personal computer users can transfer files internally,
print files on the same printer, and access the modem
pool to send/receive data to/from an external personal
computer or dial up data service.
To access these devices, a data call connection must
be established between the RPCls and DIUs. This is
accomplished by dialing the destination DIU from a
digital telephone dialpad or from a PC keyboard using
standard AT dial commands. RPCI-Dls and PDIU-Dls
share the same intercom or Primary Directory
numbers [PDN]/ports with the digital telephone to
which they are connected, while PDIU-DSs have their
own. The intercom and data call LEDs on the- digital
telephone initiates a voice or data call, respectively.
When dialing from a keyboard with AT commands,
6-38
January 1996