G4LC32ISA-LT User’s Guide
3-17
LED INDICATORS
Seven LEDs are located on the G4LC32ISA-LT (Figure 3-16) and perform the functions displayed in
Table 3-6.
Figure 3-16: LED indicators on the G4LC32ISA-LT
Table 3-6: LED Functions
LED
Indication
RUN
(Processor
status)
This indicator shows processor status. When the processor is
functioning normally, the light stays on. When the processor is
powered down, the light goes off. If the light begins to blink, it could
indicate a processor malfunction or low power supply voltage.
TX0
(COM0
transmit)
This indicator illuminates whenever COM0 is transmitting serial data.
If the LED fails to illuminate, it could indicate that the port is idle, a
wiring problem exists, or CTS is inactive.
RX0
(COM0
receive)
This indicator illuminates whenever COM0 is receiving serial data.
If the LED fails to illuminate, it could indicate that the port is idle or
a wiring problem exists.
IRQ0
(COM0
interrupt)
This indicator illuminates when an interrupt is generated by an I/O
unit on the COM0 RS-485/422 remote link. If the LED is not
illuminated, it indicates an interrupt request has not been generated
by an I/O unit, or a wiring problem exists.
TX1
(COM1
transmit)
This indicator illuminates whenever COM1 is transmitting serial data.
If the LED fails to illuminate, it could indicate that the port is idle, a
wiring problem exists, or CTS is inactive.
RX1
(COM1
receive)
This indicator illuminates whenever COM1 is receiving serial data.
If the LED fails to illuminate, it could indicate that the port is idle or
a wiring problem exists.
IRQ1
(COM1
interrupt)
This indicator illuminates when an interrupt is generated by an I/O
unit on the COM1 RS-485/422 remote link. If the LED is not
illuminated, it indicates an interrupt request has not been generated
by an I/O unit, or a wiring problem exists.
INSTALLATION AND SETUP
Summary of Contents for G4LC32ISA-LT
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Page 40: ...A 2 G4LC32ISA LT User s Guide TROUBLESHOOTING...
Page 44: ...C 2 G4LC32ISA LT User s Guide PRODUCT SPECIFICATIONS...
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Page 48: ...E 2 G4LC32ISA LT User s Guide PRODUCT SUPPORT...