Dip Switch Options - Toshiba STRATA DK14 Installation And Maintenance Manual

Peripheral Installation
PC/Data Communications Interface Units

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
SW1-1
Normally, this switch is set On to disconnect devices from RPCIs or DIUs automatically. The
connection is maintained if data is exchanged between the device and the RPCI or DIU within
eight to nine minute 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 RPCI-DI or PDIU-DI (or PDIU-DS configured
like a DCE) must hold DCD and DSR On continuously. 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 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.
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 or when
connected to a modem that tracks the DCD signal (modem set with AT&C1). 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 RPCI'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&C1) SW1-4 should be On.
12-58
Figure 12-32).
Strata DK I&M 6/00