User manual

TECHNICAL REFERENCE
8-2
Front-of-the-Case Lights (External Faxmodems)
Symbol Meaning Status
AA .......... Auto Answer 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).
ARQ/....... Error Control/
FAX ........ Fax Operations Data Mode: Automatic Repeat Request. 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.