XE1214B5 Просмотр технического описания (PDF) - Xecom

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XE1214B5

1200bps Component Modem

Xecom 

Offline Analog Loopback

Before entering offline analog loopback, the telephone line must be disconnected. Normal line

signals may disrupt modem performance during the analog loopback test. The test is started by

entering the following commands: Answer Mode - ATS16 = 1A

Originate Mode - ATS16 - 1O

With both commands, a CONNECT result code is displayed and subsequent characters typed on

the keyboard are displayed on the screen. The test may be ended by the escape command. S16

may be reset to zero by the H command.

Online Analog Loopback

This test is useful in the event that the XE1214B5 is on line with a remote modem and is receiving

many errors. The test is started by entering the command: ATS16 = 1O

The O command puts the XE1214B5 back on line. All characters entered on the keyboard should

be transmitted to the remote modem and displayed on the screen. If the information is correctly

displayed, then XE1214B5 is working properly and the problem is either in the phone line or with

the remote modem. To finish the test and return on line in the normal mode enter the command:

ATS16 = 0O

Digital Loopback

This test causes the modem to resend each received character. It is used for testing a remote

modem. The modems must be connected before the test. The test is started with the commands:

ATS16 = 4O

All the characters entered by the remote modem are looped back to its screen through the

XE1214B5 and are not displayed on the local screen.

Remote Digital Loopback

This test enables the remote modem to loop received data back to the transmitting modem. It is

useful when meaningless data is received from the remote modem or vice versa. To execute the

test, the remote modem must be capable of operating in remote digital loopback. The test is

started by the command: ATO2

To exit this test and go back on line enter the command:

ATO1

Audio Output Stage

A programmable attenuator that can drive a load impedance of 50K is provided to allow monitoring

of the telephone line signal through an external speaker. Four levels of signal (high, medium, low

and off) are provided through the L and M commands as well as the capability to automatically turn

the signal off when a data connection is established. The output of the attenuator is available on

the Audio Output (pin 12) and may be used with an external audio amplifier (such as an LM386) to

drive a low impedance speaker. The output can directly drive a high impedance transducer,

however the output may be low.

6/XECOM

XE1214B5

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