US Robotics 3Com Manuel d'utilisateur télécharger pdf (Page 54)

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.

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US Robotics 3Com Manuel d'utilisateur Page 54