User`s guide

34
Front Panel Lights (external modems only)
Symbol Meaning Status
AA Auto Answer/ Answer mode: ON when
Answer register S0 is set to 1 or higher (Auto Answer), and when
answering a call; OFF when modem originates a call.
Light flashes when there is an incoming call.
CD Carrier Detect ON if modem receives a valid data signal (carrier) from a
remote modem, indicating that data transmission is
possible. Always ON if CD override is ON (&C0).
RD Received Data Flashes when modem sends result codes or passes received
data bits.
SD Send Data Flashes when computer sends a data bit.
TR Data Terminal ON if modem receives a DTR
Ready signal from computer. Always ON (modem
ignores DTR) if the DTR override is ON (&D0).
CS Clear to Send ON until modem lowers CTS when Transmit Data hardware
flow control is enabled (&H1, &H3).
ARQ/ Error Control/ Data Mode: Automatic Repeat Request.
FAX Fax Operations ON if modem is set to &M4 or &M5 and successfully
establishes an error control connection. Flashes when
modem retransmits data to remote modem. Fax Mode: Flashes to indicate fax mode.
OH Off Hook ON when modem accesses the phone line. OFF when
modem is On Hook.