Racal Instruments 1260-38T, Руководство пользователя

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1260-38T User Manual
Racal Instruments © 1998 Module Operation 3-1
Chapter 3
MODULE OPERATION
Module
Configuration The 1260-38T is a 1 x 128 Two-Wire Scanner/Multiplexer Module
consisting of eight pairs of 1 x 8 multiplexers. These eight pairs of
multiplexers, in conjunction with interconnecting relays, allow the
1260-38T module to be configured as:
- One 1 x 64 Four-wire multiplexer
- One 1 x 128 Two-wire multiplexer
Each pair of 1 x 8 multiplexers can he independently configured
as:
- Two 1 x 8 Two-wire multiplexers
- One 1 x 16 Two-wire multiplexer
- One 1 x 8 Four-wire multiplexer
Reference should be made to Figure 3-1, 1260-38T Module
Configuration Block Diagram, and Figure 3-2, 1260-38T
Multiplexer Configuration Block Diagram.
The multiplexer pairs consist of two 1 x 8 multiplexers, giving a
total of sixteen 1 x 8 multiplexers (00 through 15
). Each 1 x 8
multiplexer consists of one two-wire common and eight two-wire
channels. The channels are numbered 0
00 0 to 0 00 7 for
multiplexer 00, through 0 15 0 to 0 15 7 for multiplexer 15.
Interconnecting relays (channels 1002, 2002, ....8002) join the
multiplexers to form multiplexer pairs. The multiplexer pairs are
formed by multiplexers 00-01, 02-03, 04-05, 06-07, 08-09, 10-11,
12-13, and 14-15.
The multiplexer pairs are joined to each other through seven more
pairs of interconnecting relays (1000, 1001,2000, 2001, …7000,
7001). This allows pairs of the module to be configured for four-
wire operation.