Micro-Aide LDM-1 Bedienungsanleitung PDF herunterladen (Seite 29)

Operation - Operating Modes

TEST MODE C - ANALOG LOOP BACK WITH TEST DATA

Test Mode C also loops the transmit channel’s analog output signal to the

input of the receive channel. However, the transmitted data is provided by an

on-board test data generator. The test data consists of alternating mark and

space bits. The test data has a Baud rate of 19,200. The receive and transmit

channels are left terminated but are disconnected from the test data (i.e., test

data is not sent to the network). In Test Mode C the Tst2 and Tst1 LEDs are

both on. The CD LED will flash as an indication that the test data is being

received properly. The RTS, CTS and Xmt indicators will illuminate depend-

ing upon the status of the DTE interface. However, these signals are ignored

in Test Mode C. The Rcv indicator will be on.

Test Mode C can also be used to test the modem separately from the network

and DTE. If a DTE is connected it should display a sequence of U characters

(i.e., ASCII code 85).

This completes the chapter on how to operate the LDM-1. The next chapter

describes maintenance of the modem.

TIP: Test Mode C requires an equalization setting of 1 (i.e., minimum).

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Micro-Aide LDM-1 Bedienungsanleitung Seite 29