Toshiba DK8, DK 16 manual Important Note

IMPORTANT NOTE!

Modems must be “smart modems” that respond to AT commands and return re- sult codes. Modems are customer-sup- plied.

10.62A modem(s) can be accessed internally for outgoing data calls or externally for incoming data calls. Modems operate as DCE devices; so PDIU- DSs that are connected to them must be configured to operate like a DTE device. In the example installation in Figure 7-24, the line side of the two modems are connected to KSTU/PSTU/PESU ports to establish a modem pool; however, the line side of modems could be connected directly to a dedi- cated CO line. If modems are connected directly to telephone network CO lines, automatic transfer of CO line voice calls to system modems (data call) will not function as described in the Data Interface User Guide. For best operation and utilization of CO lines and modems, it is recommended to con- nect modems to QSTU, PSTU or KSTU standard station ports in a modem pool configuration. The RS-232 side of the modem connects to the PDIU- DS with standard RS-232 cables; the PDIU-DS line side (RJ-11 connector) always connects to its own individual digital port. Use the following instructions to install modems to PDIU-DSs.

1)Configure the PDIU-DS as a DTE device: Disassemble the PDIU-DS and place jumper plugs P1 ~ P9 in the “B-C” position (MODEM). Reassemble the PDIU-DS and mark “B-C” on the bottom identification label for future refer- ence. (Paragraph 10.70 provides PDIU-DS disassembly/assembly instructions and Fig- ure 7-31 provides jumper plug information.)

2)Connect the PDIU-DS to the appropriate Digi- tal port circuit per the wiring diagrams in Sec- tion 100-816-208.

3)Connect the appropriate RS-232 cable be- tween the modem and the PDIU-DS. Figure 7- 28 shows an example PDIU-DS to “smart modem” RS-232 connection.

INSTALLATION-PERIPHERALS

SECTION 100-816-207

MARCH 1993

IMPORTANT NOTE!

All ten PDIU-DS EIA leads (signals) should be connected to the modem. Consult the modem’s documentation for correct RS- 232 pin requirements; the requirements may vary with each manufacturer.

4)Connect the line side of the modem to a QSTU, PSTU, KSTU or PESU standard tele- phone circuit or a dedicated CO line (consult the modem’s documentation to install the it to a CO line). Section 100-816-208provides QSTU, KSTU/PESU/PSTU station port wiring information.

5)Set the PDIU-DS DIP switch (SW1-1 ~ 4) for the desired application. Figure 7-32 shows the DIP switch location and Paragraph 10.30 de- scribes switch functions.

NOTE:

If the modem tracks carrier detect (DCD, AT&C1), SW1(4) should be “ON,” and SW1(2) should be OFF when PDIU-DS is connected to a modem.

6)Use the programs below to configure the PDIU-DS to connect to an asynchronous modem (see Programming Section 100-816-

302 for explanations and record sheets).

Program 20

•LED 01: Should always be ON for PDIU- DS ports

•LED 02: Should be ON for PDIU-DS ports connected to modems, enabling the use of AT commands and result codes when incoming calls are made from outside the system to modems con- nected to PDIU-DSs.

•LED 03: Should be set ON for PDIU-DS ports connected to modems.

•LED 04: Should always be ON for PDIU- DS ports.

•LED 05: Should be ON if the system is installed behind a PBX/Centrex that uses

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