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1260-X138 User Manual
Installation Instructions 2-4
Racal Instruments
©
2005
Since each channel is independently controlled, the user can
simultaneously connect any combination of multiplexer (MUX)
inputs to the common output of the same multiplexer.
For example, referring to
Figure 2-1
, the user may connect the
channel 71 and channel 73 inputs to the common output by closing
the channel 71 and channel 73 relays at the same time. Taking this
concept further, the user could even close the relays for channels
70 through 77 all at the same time, connecting all of this
multiplexer’s inputs to its common output.
Table 2-1 shows the group number and relays designators for the
particular groups.
Table 2-1 Relay Groups
Group Number
Group Relay
Designators
0 K7-K14
1 K14-K22
2 K23-K30
3 K85-K92
4 K93-K100
5 K101-K108
6 K116-K123
7 K124-K131
Figure 2-1 shows just one of the eight multiplexers on the 1260-X138.
All eight multiplexers can operate independently.
The block diagram for the 1260-X138 is shown in Figure 2-2.
Only
the high input and output sides of the Groups 0, 1, 2, 3, 4, and 5 are
displayed.
Please refer to Table 2-3 listed in page 2-18 for complete
input/output pin designators.
Figure 2-2 also shows that Group 0
along with Group 3, Group 1 with Group 4, and Group 2 and Group 5
can be configured to form three 2x8 2-wire mode multiplexers.
Table 2-2 lists the relays responsible for forming the 2x8 mode.
For example, by activating K31-K38, Group 0 and Group 3 can form a
2x8 2-wire multiplexer by switching common input of MUX Group 0
(E3, E2) and MUX Group 3 (E7, E6).