User`s guide

6
TECHNICAL REFERENCE
Front-of-the-Case
Lights (External
Serial Faxmodems)
Symbol Meaning Status
AA Auto Answer
mode
ON when 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 from
remote
SD Send Data Flashes when computer
sends a data bit to modem
TR Data Terminal
Ready
ON if modem receives a DTR
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)