Configuration; Dip Switch S1 (Te121A Only) - Black Box TE120A User Manual

4- AND 8-LINE CALLER ID
You'll configure your Caller ID units for your application using their front-
mounted 8-position configuration DIP switches. Both models have a switch labeled
S2 that controls RS-232 characteristics and unit number. The 8-Line model has an
additional switch labeled S1 for signal handling.

3.1 DIP Switch S1 (TE121A Only)

DIP switch S1 controls the voltage and behavior of three of the pins/signals on the
RS-232 OUT port (see Section 2.3) of the 8-Line Caller ID (TE121A), so that it will
be compatible with your other RS-232 devices. (All of the possible settings of S1's
switch positions that aren't listed below are invalid—do not use unlisted settings,
because they could disable or damage attached equipment.)
Positions 1 and 2 govern how Pin 1, Carrier Detect (CD), is handled:
• 1 OFF, 2 OFF: Pin 1 output is disabled (factory-default setting).
• 1 ON, 2 OFF: Causes continuous +12 VDC output on Pin 1.
• 1 OFF, 2 ON: Causes continuous –12 VDC output on Pin 1.
Positions 3, 4, and 5 govern how Pin 6, Data Set Ready (DSR), is handled:
• 3 OFF, 4 OFF, 5 OFF: Pin 6 output is disabled (factory-default setting).
• 3 ON, 4 OFF, 5 OFF: Causes continuous +12 VDC output on Pin 6.
• 3 OFF, 4 ON, 5 OFF: Causes Pin 6 (DSR) output to follow Pin 8 (CTS) output.
• 3 OFF, 4 OFF, 5 ON: Causes continuous –12 VDC output on Pin 6.
Positions 6, 7, and 8 govern how Pin 9, the proprietary Busy signal, is handled:
• 6 OFF, 7 OFF, 8 OFF: Pin 9 output is disabled (factory-default setting).
• 6 ON, 7 OFF, 8 OFF: Causes continuous +12 VDC output on Pin 9.
• 6 OFF, 7 ON, 8 OFF: Causes Pin 9 output to follow Pin 9 input from the
RS-232 IN port.
• 6 OFF, 7 OFF, 8 ON: Causes continuous –12 VDC output on Pin 9.
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3. Configuration