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Chapter 3 System Overview
Channel and Slot Addressing
3
Channel and Slot Addressing
A channel refers to an individual relay on a switching module, or an
individual bit/port on a digital I/O module. The channel address is in the
form of snn, where s represents slot number and nn represents a channel
number.
For all mainframes, slot 0 refers to the 3499A/B/C control board. Valid
slot numbers are:
The channel number, nn, is plug-in module dependent. Detailed
information about channel numbers of individual plug-in modules is
given below and on the following pages.
3499A slots 0 through 5
3499B slots 0 through 2
3499C slots 0 through 9
Plug-in Module
Channel Addressing (snn)
s = Slot Number; nn = Channel Number
N2260A
40-Channel MUX Module
a
1-Wire Mode: s00, s01... s78, s79
b
2-Wire Mode: s00, s01...s38, s39
Dual 2-Wire Mode: s00, s01...s38, s39
4-Wire Mode: s00, s01...s18, s19
c
N2261A
40-Channel GP Relay Module
s00, s01, s02, s03... s37, s38, s39
N2262A
4X8 Matrix Module
Row 0, 1, 2, 3; Column 0, 1, 2, 3... 6, 7
(s00, s01, s02... s07; s10, s11, s12... s17;
s20, s21, s22... s27; s30, s31, s32... s37)
d
a. The N2260A and N2266A can be used as an 80-channel 1-wire MUX module, a 40-channel 2-wire MUX module, two
20-channel 2-wire MUX modules, or a 20-channel 4-wire MUX module.
b. The Low (L) terminals of the 40 2-wire channels form the first 40 1-wire channels (Channels 00-39), and the High (H)
terminals of the 40 2-wire channels form the second 40 1-wire channels (Channels 40-79).
c. The first channels (CH00 & CH20) of either banks (BANK 0 and BANK 1) form Channel 00, the second channels
(CH01 & CH21) of either banks form Channel 01, and so on.
d. A channel number on a matrix module is formed in Slot-Row-Column format, i.e., channel address s23 means row 2,
column 3 in Slot s.
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