Toshiba DK 16, DK8 manual DIP Switch Options

INSTALLATION-PERIPHERALS

SECTION 100-816-207

MARCH 1993

•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 SW1-2should be set OFF in most cases (see Figure 7- 32 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.

10.30DIP Switch Options

10.31The 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 7-32).

• 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 SW1-1is 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 SW1-2is OFF, DSR follows DTR and DCD will be ON only when the DIU is connected on a data call to another DIU. SW1-2should 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; and whenever PDIU-DS is connected to a modem.

• 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 PDIU is receiving an incoming call. SW1-3should 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). Some- times, the DTE device may use RTS/CTS for Ready/Busy flow control, in these cases SW1-4should 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. If the DIU-DS is connected to a modem that tracks carrier detect (AT&C1) SW1-4 should be ON.

10.40PDIU-DI to Personal Computer (PC) Installation

10.41The 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.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 re- quired.

3.Change the PDIU-DI escape sequence per the guidelines in paragraph 10.63.

1)Install the digital telephone that is to be equipped with PDIU-DI per the instructions in Section 100-816-206and the drawing in Sec- tion 100-816-208.

2)Install the PDIU-DI under the digital telephone per the instructions in Section 100-816-206.

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