Toshiba DK8, DK 16 manual Important Notes

10.13Installation instructions for these devices are provided in Paragraphs 10.40 thru 10.70. Call paths and scenarios for five types of data test calls are provided in Paragraphs 10.82 ~ 10.86. Step- by-step data calling procedures are provided in the Data Interface User Guide in the Installation & Maintenance Manual, Operating Procedures.

10.20EIA Interface Leads (Signals)

10.21Both DIUs operate with nine standard EIA RS-232 interface leads (signals) on which signal- ing data is transmitted and received. DIUs connect to serial data devices with standard RS-232 cables, available from telephone supply stores (see Fig- ures 7-25 ~ 7-30). The PDIU-DI/PDIU-DS requires nine signals for some applications, but can function with eight using modular cords and connectors with RJ45/DB25 adapters for other applications. If un- certain which signals are necessary for an applica- tion, all nine should be connected.

IMPORTANT NOTES!

1.The PDIU-DI is always a DCE device; the PDIU-DS may be a DTE or DCE, depending on how its internal jumpers (1 ~ 9) are configured.

2.In the descriptions below, when a sig- nal is ON, its potential is about seven volts positive relative to signal ground (pin 7); when a signal is OFF, it is about 7 volts negative relative to the signal ground (pin 7).

•Frame Ground (FG, Pin 1): The FG signal (EIA circuit AA) is a protective or safety ground which is bonded to the PDIU-DI/PDIU-DS PCB. If required by local codes, the FG should be con- nected to external ground.

•Signal Ground (SG, Pin 7): The SG signal (EIA circuit AB) establishes the common ground ref- erence for all other PDIU and data device sig- nals and must be wired for all applications.

•Transmit Data (TD, Pin 2): DTE devices trans- mit and DCE devices receive data on the TD lead (EIA circuit BA). Before the DTE device can transmit the TD signal, the RTS, CTS, DSR, and DTR signals (all discussed below) must be ON. The TD signal is OFF in the idle state.

INSTALLATION-PERIPHERALS

SECTION 100-816-207

MARCH 1993

•Receive Data (RD, Pin 3): The DCE device transmits data to the DTE device on the RD lead (EIA circuit BB); the DTE receives data on the RD.

•Request to Send (RTS, Pin 4): Some DTE devices send an RTS signal (EIA circuit CA) to the DCE device when they are ready to transmit data on the TD lead. If the DTE device does not generate the RTS signal, the DIU DIP switch SW1-4 should be set ON to inform the DIU. Sometimes, the DTE/DCE device may use RTS/ CTS for Ready/Busy type flow control, in these cases DIP switch SW1-4 should be OFF (see Figure 7-32 for DIP switch information).

•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 line side. The DCE device sends this signal only when it receives the RTS signal from the DTE device. Sometimes, the DTE/DCE device may use RTS/CTS for Ready/Busy type flow control; in these cases, dip switch SW1-4should be OFF (see Figure 7-32 for DIP switch informa- tion).

•Data Set Ready (DSR, Pin 6): When connected to the communication channel and prepared to exchange control characters to initiate data trans- mission, the DCE device sends the DSR signal (EIA circuit CC) to the DTE device. If the PDIU DIP switch SW1-2 is set ON, DSR will be ON continuously; if the switch is set OFF, DSR follows DTR (if DSR is ON, DTR is ON, etc.) SW1-2 should be OFF in most cases (see Figure 7-32 for DIP switch information).

•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 require 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; PDIU DIP switch SW1-2 is set ON to set the DCD ON continuously; if set OFF, the DCD signal will only be ON when connection between two DIUs is established and OFF when a connection is not established. SW1-2 is set OFF when the DTE/DCE uses the DTR/DSR signals for Ready/Busy flow control (see Figure 7-32 for DIP switch information).

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