Datalogic Scanning CBX500 - Manual (Page 12)

CBX500 INSTALLATION MANUAL
12
RS485 HD
ON
OFF
Figure 11 – RS485 HD Termination Resistance Switch
The RS485 HD termination resistance switch enables or disables the insertion of the bus termination resistor for
RS485 Half Duplex Multidrop applications.
CAUTION
In Multiplexer applications the termination resistor must be enabled ONLY on the last device
of the chain, the farthest away from the Multiplexer (assuming the Multiplexer is the first
device of the chain). On all the other devices this resistor MUST be OFF (disabled).
This switch must also be OFF (disabled) when Fieldbus Modules are used.
INDICATOR LEDS
blue/red
yellow
green
yellow
green
Figure 12 – Indicator LEDs
There are five Indicator LEDs which signal power and I/O activity and are visible from the CBX500 outside cover.
The Power LED is blue when power is correctly applied to the CBX500 and the power switch is turned on.
This LED is red if power polarity is incorrect. In this case the connected reading device and optional Backup
Module are protected.
CAUTION
If external I/O devices are powered through CBX500 (connected to +V/-V), they are not
protected from polarity inversion.
The remaining four LEDs signal activity on the relative I/O lines. Their meaning depends on the software
configuration of the connected reading device.