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Channel Addresses
32 Getting Started
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Module
Figure 1-19. Card Numbers in a Multiple-Module Switchbox
Channel addresses (channel_list) have the form (@ccnn) where
cc = multiplexer card number (01-99) and nn = channel numbers (00-63
and 90-94). Channels 90 through 94 are tree relays related to the analog bus
and the reference thermistor used for thermocouple measurements.
You can address single channels (@ccnn), multiple channels
(@ccnn,ccnn,...), sequential channels (@ccnn:ccnn), groups of
sequential channels (@ccnn:ccnn,ccnn:ccnn) or any combination.
Multiplexer channels can be addressed using channel numbers or channel
ranges. For a single-module switchbox, channel ranges can span across the
channels. For multiple-module switchboxes, channel ranges can span
across the channels of all modules.
Use commas (,) to form a channel list or use a colon (:) to form a channel
range. Only valid channels can be accessed in a channel list or channel
range. The channel list or channel range must be from a lower channel
number to a higher channel number. For example, &/26 # is
acceptable, but &/26 # generates an error.
Using the channel range (@n00:n99) with the SCAN command causes all
channels to be scanned except the tree relays (channels 90 through 94).
These are not typical scan channels and are not included in a scan list.
You can however, include channel 93 in a scan list (e.g., # ) when
making a four-wire resistance measurement. The only restriction is that
6&$1 02'( must be )5(6 (four-wire resistance) for channel 93 (the voltage
sense). The current source channel is 94 and is automatically switched.
Some example channel lists/ranges follow.
CARD NUMBER 01
Multiplexer Number 1
Logical Address = 112
Secondary Address = 14
CARD NUMBER 02
Multiplexer Number 2
Logical Address = 113
CARD NUMBER 03
Multiplexer Number 3
Logical Address = 114
Chapter 1
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