NEC nd-20292 manual LlolBLlmElllol

Refer to the modem instruction manual to set up the

. different parameters. Some modems use dip switches

;for set up, and some types need a PC with a terminal emulation program to set these parameters.

NOTE: Problems may occur at baud rates higher than 1200 on standard voice grade telephone lines. If a transmission rate of 2400 baud is required, it may be necessary to use data grade lines to ensure the integrity of the data being transmitted between modems.

Figure 910-l provides an overview of the relationship of equipment used with an RAA-E Unit. After a connection is established, the signal flow at the remote location is from the computer, to the modem and out through the CO. At the Electra MarkII location, the signal comes in from the CO in one of two ways (A): through the CO&E ETU; from there it is transferred or diverted via DIT/ANA into the SLI-E( ) ETU. From the SLI-E( >ETU; the signal goes through the modem to the RAA-E Unit and to the ESI-E( 1 ETU programming port of the Electra Mark11 system. Signal flow from the on site location (to a remote location) is in the opposite direction. m 03): the CO may be connected directly to the modem if so desired.

SECTION 920

RAA-E and MODEM INSTALLATION

920.1RAA-E Unit SWITCH SETTINGS

The RAA-E Unit has five switches which are used to set up proper interfacing to the modem or computer, and between the RAA-E Unit and the Electra Ma&II system. Switch SW1 is located on the front of the RAA- E Unit. Switches SW2-SW5 are accessed by removing the grounding screw located on the rear of the RAA-E Unit and pulling back and up on the RAA-E cover (See

Figure 920-l). Reassembly is accomplished by

reversing this procedure. Switches perform the following functions:

NOTE: If the switch settings are changed for any reason, disconnect and reconnect the modular line cord. This allows the RAA-E Unit to read the new settings. (Table 920-l shows the switch settings.)

1.SWl- Baud Rate Switch is a bank switch consisting of 4 dip switches accessible from the front panel next to the POWER LED indicator. This switch must be set to the same baud rate as the modem connected to the RAA-E Unit. Only one dip switch should be set to the ON position, the

	ND-20292
	CHAPTER 9
	APRIL, 1990
A	Pull Cover Back and Up
Grounding Screw	Front

Figure 920-l Removal of RAA-E Cover

(Rear View of RAA-E Unit)

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DIRECT MODEM RAA 16LK IMS MKll High Low

I/

25 CN2

IIIIIIIIIIIIIIIIII

1II K-232-C I 1 1

Figure 920-2 RAA-E Unit Switch Locations

(Top View)

other three must be off. A baud rate setting of 300, 600, 1200, or 2400 can be obtained by turning on the corresponding dip switch.

2.SW2 - Direct/Modem Switch is used to tell the processor in the RAA-E Unit that it is connected directly to the computer (DIRECT position) or to a modem (MODEM position).

3.SW3 - RAA/lGLK Switch tells the RAA-E Unit how to configure itself to translate the information being received from the system and being sent to the system. This switch should be set to the RAA position. The 16LK position is reserved for future use.

900-3