Courier 56K Business Modem

Command Reference

This appendix explains how to view the twelve LEDs on the front of your Courier 56K Business Modem.

This LED	Status	Means your Courier 56K Business Modem
HS	On	Has made a 4800 bps or faster connection. Once this light is on, it remains on until reset. This can be configured with S69.
HS	Off	Has not made a 4800 bps or faster connection since last reset
AA	On	Is ready to accept calls
	Blinking	Has detected an incoming call
	Off	Is not ready to accept calls
CD	On	Has detected a carrier from a remote device or carrier detect has been forced on (using DIP switch 6)
CD	Off	Has not detected a carrier
OH	On	Has control of the line
OH	Off	Does not have control of the line
RD	Flashing	Is sending data to your computer
RD	Off	Is idle
SD	Flashing	Is receiving data from your computer
SD	Off	Is idle
DTR	On	Has received a Data Terminal Ready (DTR) signal from your computer, or DTR is forced on (using DIP switch 1)
DTR	Off	Has not detected DTR
MR	On	Is powered on
	Flashing	Is retraining with a remote device or is in Test mode
	Off	Is powered off
RTS	On	Has detected the Ready to Send (RTS) signal from your computer
RTS	Off	Has not detected the RTS signal from your computer
CTS	On	Is sending your computer the Clear to Send (CTS) signal
CTS	Off	Is not sending your computer the CTS signal
SYN	On	Is in synchronous mode
	Blinking	Has activated Dial Security
	Off	Is not in synchronous mode/Dial Security not active
ARQ/FAX	On	Is using V.42 bis error correction
	Flashing	Is retransmitting data to the remote modem
	Blinking	Is in fax mode
	Off	Is not using error control, not retransmitting data, and not faxing