Tyco Safety Products / Software House PI26 User Manual
Introduction
C-2
apC/8X Technical Manual
Introduction
The apC/8X supplies 12 volts at its connectors; however, the amount of
power that actually reaches each personality board in a chain is less than 12
volts.
power that actually reaches each personality board in a chain is less than 12
volts.
The RM-4 requires at least 7.5 volts to operate properly.
The RM-4E requires at least 11 volts to operate properly.
The RM-4E requires at least 11 volts to operate properly.
The total voltage is lowered by each reader and by the resistance of the wire.
Whether the personality board chain needs a local power supply depends on
all the following factors:
Whether the personality board chain needs a local power supply depends on
all the following factors:
Number of devices on the bus
Current draw of each device
Distance between the devices in the chain
Distance between the devices and the apC/8X
Wire gauge used to connect the readers and the apC/8X
Current draw of each device
Distance between the devices in the chain
Distance between the devices and the apC/8X
Wire gauge used to connect the readers and the apC/8X
Refer to sections that follow to calculate the power in a chain. Be sure you
read and understand the instructions and examples in each section before
beginning to calculate the maximum wiring lengths for your application.
read and understand the instructions and examples in each section before
beginning to calculate the maximum wiring lengths for your application.