Multitech MT5600BA Podręcznik Użytkownika Pobierz pdf (Strona 54)

Appendix D – Pin Descriptions

Multi-Tech Systems, Inc. MT5600BA-V92 User Guide 54

Appendix C - Pin Descriptions

RS-232 Pin Descriptions

Label

I/O Type

Signal Name/Description

CGND

GND

CGND is tied common to GND on the modem’s PCB

Transmitted Data The DTE uses the TD line to send data to the modem

for transmission over the telephone line or to transmit commands to the

modem.

Received Data The modem uses the RD line to send data received from

the telephone line to the DTE and to send modem responses to the DTE.

RTS

Request to Send is used for hardware flow control.

CTS

Clear To Send is controlled by the modem to indicate whether or not the

modem is ready to transmit data. CTS high indicates to the DTE that

signals presented on TD will be transmitted to the telephone line. CTS

low indicates to the DTE that it should not transfer data across the

interface on TD.

DSR

Out

Data Set Ready indicates modem status to the DTE. DSR low indicates

that the DTE is to disregard all signals appearing on the interchange

circuits except Ring Indicator (RI). It reflects the status of the local data

set, and does not indicate an actual link with any remote data

equipment.

GND

Ground.

CFLO

Carrier Detect used to signal to the DTE that a carrier has been detected.

+12V

A positive voltage output from the modem used for tests or for strapping

signals high if needed.

TCLK

Transmit Clock output from modem, used in synchronous mode.

RCLK

Receive Clock output from modem, used in synchronous mode.

V54-2

Analog Loop input to modem to enable analog loop test.

DTR

Data Terminal Ready input to modem from DTE to control answering and

disconnection of modem.

RDL

Remote Digital Loop Input to modem to enable RDL test.

Ring Indicator output high indicates the presence of a ring signal on the

telephone line.

XCLK

External Clock input to modem used in special synchronous applications.

Test Mode output from modem to indicate modem is in one of the test

modes.

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