Toshiba Perfecptione Installation And Maintenance Manual page 67

INSTALLATIONIN~TRUCTlONS
SECTION 200-255-204
FEBRUARY1992
l
Clear to Send (CTS, Pin 5): The DCE
device sends the CTS signal (EIA circuit
CB) which indicates that it is prepared to
transmit data to the DTE device. The
DCE device sends this signal, only when
it receives the RTS signal from the DTE
device. Sometimes, the DTE/DCE de-
vice may use RTS/CTS for Ready/Busy-
type flow control; in these cases, dip
switch SW1 -4 should be set to OFF (see
Figure 4-55 for the DIP switch informa-
tion).
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Data Set Ready (DSF?, Pin 6): When
connected to the communication chan-
nel and prepared to exchange control
characters to initiate data transmission,
the DCE device sends the DSR signal
(EIA circuit CC) to the DTE device. If the
PDIU DIP switch SWl-1 is set to OFF,
DSR and DCD (see DCD description
below) will be ON continuously; if the
switch is set to ON, the PDIU generates
DSR only after receiving the DTR signal.
Sometimes, DTE/DCE devices use DTW
DSR for Ready/Busy flow control; in these
cases, DIP switch SWl-2 should be set
to OFF (see Figure 4-55for the DIP switch
information).
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Signal Ground (SG, Pin 7): The SG
signal (EIA circuit AB) establishes the
common ground reference for all other
PDIU and data device signals, and must
be wired for all applications.
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Data Carrier Detect (DCD, Pin 8): The
DCE
device sends the DCD signal (DCD,
Pin 8) when receiving the carrier signal
on the line side. Before transmitting or
receiving data, most DTE devices re-
quire that the DCD be ON. If the carrier
signal is removed by the remote end or
lost due to a fault condition on the line,
the DCE notifies the DTE device by an
OFF condition with the DCD signal. To
set the DCD on continuously, PDIU DIP
switch SW1 -2 is set to ON; if set to OFF,
the DCD signal will be on during the
communication state only. SWl-2 is set
to OFF when the DTE/DCE uses the
DTFUDSR signals for Ready/Busy flow
control(seeFigure4-55fortheDIPswitch
information).
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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 re-
ceive data. Sometimes, DTE/DCE de-
vices use DTWDSR for Ready/Busy flow
control; in these cases, DIP switch SWI-
2 should be set to OFF (see Figure 4-55
for the DIP switch information).
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Ring Indicator (Rl, 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
PDIU DIP switch SWI-3 is set to ON, the
RI signal will be on continuously; if the
switch is set to OFF, the RI signal will be
one second on/three seconds off.
Pin No. Designation
1 1 1 FG 1 Protective Ground/Frame
1 6 IDSRl Data Set Readv (from PDIU)
7 SG Signal Ground/Common
Return
8 RCD Receive Carrier Detect (from PDIU)
, 5 ST2 Transmission Signal Element Timing
(from PDIU)
I 171RTI
Transmission Signal Element Timing
(from PDIU) I
20 DTR Data Terminal Ready/Equipment
Ready (to PDIU)
22 Cl Ring Indicator (from PDIU)
4-45