Black Box SERIALPARALLEL CONVERTER IV PI126A - Manual (Page 18)

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CHAPTER 4: Reading the LED
4. Reading the LED
Once your Converter is properly configured and
installed, it should operate transparently—as if it were a
standard cable connection. Operating power is derived
from the RS-232 data and control signals; there is no
“ON/OFF” switch.
The Converter indicates data activity by blinking. When
the Converter has another message to report, the LED
blinks according to the codes in Table 4-1 below.
Table 4-1. LED Codes
••-•—••-•— Computer is sending data
•—•—•— Serial device is connected; computer is not sending
data
••—••— Both serial and parallel devices are connected;
computer is not sending data
•-•—•-•— Printer not ready, data held in buffer
••••—•••• Computer ignoring flow control, data lost
Key:
• Blink
- Short pause
— Long pause