Dantel A11-44202-00 Руководство по установке и эксплуатации - Страница 4

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CIRCUIT DESCRIPTION

OTE

1. No strapping is required to

choose an interface. Data interfac-

es are selected by wiring to the ap-

propriate edge connector pins.

2. Only one interface can be active

at a time. Having two interfaces

active will cause sporadic opera-

tion.

3. If the RS-485 interface is not

used, edge connector pin 4 must

be grounded.

4. If the RS-422 interface is not

used, edge connector pins 6 and 8

must be grounded.

5. If neither RS-422 or RS-485 in-

terfaces are used, edge connector

pins 4, 6, and 8 must be grounded.

6. If the RS-422 interface is used,

but handshaking is not required,

edge connector pin 8 must be

grounded.

AGE

Data Interfaces

The multiple data interfaces provide Inout/Output (IO) ports for:

♦

RS-232

♦

RS-422

♦

RS-485

♦

TTL/CMOS

Each interface has dedicated edge connector pins. The desired

interface is selected by simply connecting leads to the appropriate

pins. Each interface has all the necessary logic, gating, line

drivers, and line receivers to interface to the data equipment.

Data activity activity is indicated by LEDs for:

♦

Interface Transmit (TD)

♦

Interface Receive (RD)

♦

Carrier Detect (CD)

♦

Clear To Send (CTS)

♦

Data Terminal Ready (DTR)

♦

Ready To Send (RTS)

Modem IC

The modem IC is an asynchronous FSK voiceband type with

clocking oscillator and supplimentary functions for:

♦

Interface control and handshaking.

♦

Signal processing.

♦

Digital filtration

Transformers

The transformers are 600-to-600 ohm and provide facility-side to

circuit isolation with circuit-side zener diode protection on both

four-wire and two-wire applications. The facility-side is accessed

using edge connector pins or by front panel jacks (normal-through

and monitor).

Amplifiers

The transmit and receive amplifiers are place in the facility-side

circuitry between the transformers and the modem IC. They

provide separate transmit and receive gain adjustment using

individual front panel potentiometers and 20dB High/Low gain

straps. Front panel test points are provided for setting the receive

level. The transmit level is adjustable using the front panel

monitoring jack.

44202-0898 <90-00004>