Serial Port Leds - OPTO 22 SNAP-PAC-S1 User Manual

Serial Port LEDs

The S0, S1, and S2 LEDs on a SNAP-PAC-S1 indicate serial port operation as follows:
• Green—Transmit
• Red—Receive
• Amber—Transmit and Receive (the LED is actually changing rapidly between green and red,
which appears amber)
Each serial port on a SNAP-PAC-S2 has two green LEDs to indicate Transmit and Receive activity for
that port.
CHAPTER 3: MAINTENANCE AND TROUBLESHOOTING
SNAP PAC S-Series User's Guide
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