pinout (распиновка)

EIA-449 (RS-449) interface

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The RS449 interface is a generic connector specification. It's not an actual interface. The connector pinning was originally designed to support RS422 for balanced signals, and RS423 for the unbalanced signals. And should have been the succesor of RS232.

37 pin D-SUB MALE connector  at the DTE (Computer)

Common names: EIA-449, RS-449, ISO 4902. Primary channel Pin Name V.24 Dir Description Type 1 101 Shield Ground 2 SI 112 Signal Rate Indicator Control 3 n/a n/a unused 4 SD- 103 Send Data (A) Data 5 ST- 114 Send Timing (A) Timing 6 RD- 104 Receive Data (A) Data 7 RS- 105 Request To Send (A) Control 8 RT- 115 Receive Timing (A) Timing 9 CS- 106 Clear To Send (A) Control 10 LL 141 Local Loopback Control 11 DM- 107 Data Mode (A) Control 12 TR- 108.2 Terminal Ready (A) Control 13 RR- 109 Receiver Ready (A) Control 14 RL 140 Remote Loopback Control 15 IC 125 Incoming Call Control 16 SF/SR+ 126 Signal Freq./Sig. Rate Select. Control 17 TT- 113 Terminal Timing (A) Timing 18 TM- 142 Test Mode (A) Control 19 SG 102 Signal Ground Ground 20 RC 102b Receive Common Ground 21 n/a n/a unused 22 SD+ 103 Send Data (B) Data 23 ST+ 114 Send Timing (B) Timing 24 RD+ 104 Receive Data (B) Data 25 RS+ 105 Request To Send (B) Control 26 RT+ 115 Receive Timing (B) Timing 27 CS+ 106 Clear To Send (B) Control 28 IS n/a Terminal In Service Control 29 DM+ 107 Data Mode (B) Control 30 TR+ 108.2 Terminal Ready (B) Control 31 RR+ 109 Receiver Ready (B) Control 32 SS 116 Select Standby Control 33 SQ 110 Signal Quality Control 34 NS n/a New Signal Control 35 TT+ 113 Terminal Timing (B) Timing 36 SB 117 Standby Indicator Control 37 SC 102a Send Common Ground Note: Direction is DTE (Computer) relative DCE (Modem). Name Description Function AA Shield Ground Also known as protective ground. This is the chassis ground connection between DTE and DCE. AB Signal Ground The reference ground between a DTE and a DCE. Has the value 0 Vdc. BA Transmitted Data Data send by the DTE. BB Received Data Data received by the DTE. CA Request To Send Originated by the DTE to initiate transmission by the DCE. CB Clear To Send Send by the DCE as a reply on the RTS after a delay in ms, which gives the DCEs enough time to energize their circuits and synchronize on basic modulation patterns. CC DCE Ready Known as DSR. Originated by the DCE indicating that it is basically operating (power on, and in functional mode). CD DTE Ready Known as DTR. Originated by the DTE to instruct the DCE to setup a connection. Actually it means that the DTE is up and running and ready to communicate. CE Ring Indicator A signal from the DCE to the DTE that there is an incomming call (telephone is ringing). Only used on switched circuit connections. CF Received Line Signal Detector Known as DCD. A signal send from DCE to its DTE to indicate that it has received a basic carrier signal from a (remote) DCE. CH/CI Data Signal Rate Select (DTE/DCE Source> A control signal that can be used to change the transmission speed. DA Transmit Signal Element Timing (DTE Source) Timing signals used by the DTE for transmission, where the clock is originated by the DTE and the DCE is the slave. DB Transmitter Signal Element Timing (DCE Source) Timing signals used by the DTE for transmission. DD Receiver Signal Element Timing (DCE Source) Timing signals used by the DTE when receiving data. IS terminal In Service Signal that indicates that the DTE is available for operation NS New Signal A control signal from the DTE to the DCE. It instructs the DCE to rapidly get ready to receive a new analog signal. It helps master-station modems rapidly synchronize on a new modem at a tributary station in multipoint circuits RC Receive Common A signal return for receiver circuit reference LL Local Loopback / Quality Detector A control signal from the DTE to the DCE that causes the analog transmision output to be connected to the analog receiver input. RL Remote Loopback Signal from the DTE to the DCE. The local DCE then signals the remote DCE to loopback the analog signal and thus causing a line loopback. SB Standby Indicator Signal from the DCE to indicate if it is uses the normal communication or standby channel SC Send Common A return signal for transmitter circuit reference SF Select Frequency A signal from the DTE to tell the DCE which of the two analog carrier frequencies should be used. SS Select Standby A signal from DTE to DCE, to switch between normal communication or standby channel. TM Test Mode A signal from the DCE to the DTE that it is in test-mode and can"t send any data. Reserved for Testing

37 pin D-SUB FEMALE connector  at the DCE (Modem)

Источник: RS449 Page at Connectivity Knowledge Platform (Made IT)