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Connecting Inputs
Multi provides four fixed inputs and other eight lines can be freely
configured as Inputs or Outputs; when lines are configured as input
these are called: Configurable inputs.
All the inputs can be either work as digital or supervised; this type of
configuration is done at the EBI level, so there are no jumpers on the
board for this type of setting.
The typical connection for supervised inputs requires using the couple
of yellow and white resistors distributed into the device support kit.
Yellow resistor: 1210 Ohm 1%
White resistor: 392 Ohm 1%
Close contact resistance: 296 Ohm
Open contact resistance: 1210 Ohm
OSDP
Switch
Meaning
reader
Reader1
SW3.1
RS485 termination resistor, Data A.
ON = termination resistor inserted
OFF = termination resistor not inserted
SW3.2
RS485 termination resistor, Data B.
ON = termination resistor inserted
OFF = termination resistor not inserted
Reader2
SW4.1
RS485 termination resistor, Data A.
ON = termination resistor inserted
OFF = termination resistor not inserted
SW4.2
RS485 termination resistor, Data B.
ON = termination resistor inserted
OFF = termination resistor not inserted
Reader3
SW5.1
RS485 termination resistor, Data A.
ON = termination resistor inserted
OFF = termination resistor not inserted
SW5.2
RS485 termination resistor, Data B.
ON = termination resistor inserted
OFF = termination resistor not inserted
Reader4
SW6.1
RS485 termination resistor, Data A.
ON = termination resistor inserted
OFF = termination resistor not inserted
SW6.2
RS485 termination resistor, Data B.
ON = termination resistor inserted
OFF = termination resistor not inserted
Table 4 - RS485 Terminator resistor switches
Default
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
29
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