TempScan / MultiScan User's Manual Chapter 3: Exp/10A Expansion Unit 31
Slave Configuration
CAUTION
CAUTIONCAUTION
CAUTION
Avoid linking two or more expansion chassis with the same slave address.
Otherwise, the unspecified addresses may result in operating errors.
For the master/slave configuration to operate correctly, the master unit must either be a
TempScan/1100 or MultiScan/1200; it cannot be an Exp/10A or Exp/11A expansion unit.
Furthermore, each Exp/10A unit must be assigned a unique slave address. Following simple binary
weighting, this slave address is set by using microswitches 5 through 8 of the rear panel DIP switch. In
the following figure, DIP microswitch 8 is in the up position, indicating the default slave address 1.
With all four microswitches 5, 6, 7 and 8 in the up position, this setting indicates a slave address of 15
(8 + 4 + 2 + 1). A maximum of 15 Exp/10A slave addresses can be set, while the address of 0 is not
allowed. The Exp/10A factory default is address 1.
Note:
The address of 0 is not allowed because this is reserved for the master unit address.
Channel Assignment
Channels 1 through 32 are always in the TempScan/1100, and channels 1 through 24 are always in the
MultiScan/1200, while the channels in the Exp/10A expansion unit are treated as extended channels.
With the first Exp/10A slave unit, the first channel in the first scanning card is channel 33 in the
TempScan/1100 system, and channel 25 in the MultiScan/1200 system. With the same slave unit, the
first channel in the second scanning card is channel 65 in the TempScan/1100 system, and channel 49
in the MultiScan/1200 system. The order of multiple Exp/10A expansion units are set up using the rear
panel DIP switches, as described earlier.
Even if a scanning card slot is left empty in the master unit and/or slave unit(s), the channel
assignments remain the same, as shown in the table. For a 16-channel TempScan/1100 scanning card,
the system still assigns 32 channels to the card slot with the second 16 channels ignored. Likewise, for
a 12-channel MultiScan/1200 scanning card, the system still assigns 24 channels to the card slot with
the second 12 channels ignored. For example, if a 16-channel TempRTD/16B scanning module is
installed in the first slot of Logical Unit 2 (the first Exp/10A), then channels 33 through 48 will be
assigned and channels 49 through 64 will be ignored.
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