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SERIES II INTELLIGENT DATA/FAX MODEMS
13) FAX (FX). This LED is lit when the modem is connected in FAX
mode.
14) 336+ (MD1640A) only: ERROR (ERR). When this LED is lit, either
the leased line is down and the modem is in dial backup mode, or else
the self-test has failed.
1.9 Controls on PC Board
The Series II Modem is designed on a single printed circuit (PC) board.
This board contains one 16-position DIP-Switch (numbered 1-16). The
DIP-Switches are accessible through a cut-out on the side of the
modem. There is also a knob which is used to adjust the speaker
volume. This knob is accessible through the modem's rear panel.
The sixteen DIP-Switches control various modem options or set default
values for Command Mode operation. There is a difference in how
several of the switches operate depending on whether you are in syn-
chronous or asynchronous mode. Refer to the switch label on the
bottom of the Modem for an exact list of the switch functions in
asynchronous and synchronous operation.
Chapter 9 of this manual also provides detailed instructions on
configuring all of the Modem's PC board options.