Multi-Tech Systems MT5600BA-V.90, MT5600BA-V.92, MT5600BL-V.90 Appendix F - Pin Descriptions, RS-232Pin Descriptions

Appendix F - Pin Descriptions

Appendix F - Pin Descriptions

RS-232 Pin Descriptions

Label	Pin	I/O type	Signal name/description
CGND	1	GND	CGND is tied common to GND on the modem’s PCB.
TD	2		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.
RD	3		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	4		Request to Send The RTS signal is used for hardware
			flow control.
CTS	5		Clear To Send CTS 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	6	Out	Data Set Ready DSR 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	7	GND	Ground.
CFLO	8	CD	Carrier Detect The modem uses the CD line to signal
			to the DTE that a carrier has been detected.
+12V	9		A positive voltage output from the modem used for tests
			or for strapping signals high if needed.
	10		NC
	11		NC
	12		NC
	13		NC
	14		NC
TCLK	15	TC	Transmit Clock Output from modem, used in
			synchronous mode.
	16		NC
RCLK	17	RC	Receive Clock Output from modem, used in
			synchronous mode.
V54-2	18	AL	Analog Loop Input to modem to enable analog loop test.
	19		NC
DTR	20	DTR	Data Terminal Ready Input to modem from DTE to
			control answering and disconnection of modem.

Multi-Tech Systems, Inc. MT5600BA/BL Series User Guide (S000276E) 62