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Chapter 7 Plug-in Modules
N2260A 40-Channel MUX Module
7
1-Wire Mode In this mode, either the High (H) or Lo (L) terminal of a
channel is switched to the single-ended (SE-COM) terminal. The Lo
terminals form the first 40 1-wire channels (00-39), and the Hi terminals
form the second 40 1-wire channels (40-79). Only one channel can be
closed at a time in the 1-wire mode.
2-Wire Mode This is the default mode of the N2260A and provides 40 2-
wire channels. In this mode, the Hi and Lo terminals of a channel are
switched to Hi and Lo common terminals (COM0 and COM1). The
channels are numbered 00 through 39.
Dual 2-Wire Mode In this mode, the N2260A is separated into two
independent banks (BANK 0 & BANK 1). Each bank consists of 20 2-
wire channels and a corresponding common bus, COM0 and COM1. The
channels in BANK 0 are numbered 00 through 19, and the channels in
BANK 1 are numbered 20 through 39.
Note You must modify the PC board to use this mode of operation. The
modification is described in the next section.
4-Wire Mode In this mode, the two banks (BANK 0 & BANK 1) are
paired to form a 20-channel 4-wire multiplexer. The first channels of
each bank (CH00 & CH20) form Channel 00, the second channels of the
each bank (CH01 & CH21) form Channel 01, and so on.
Note An instrument power-on or reset will set the N2260A to its default
configuration as a 40-channel 2-wire MUX module.
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