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RS-449
    
RS-449 defines functional/mechanical interfaces for DTEs/DCEs that employ serial binary data interchange and is usually used with synchronous transmissions. It identifies signals (TD, RD, etc) that correspond with the pin numbers for a balanced interface on DB37 and DB9 connectors. RS-449 was originally intended to replace RS-232, but RS-232 and RS-449 are completely incompatible in mechanical and electrical specifications. Following are the common or standard wiring pinouts for Serial Data Transmission cables.
1 Shield 9 Clear to send 17 Terminal timing 25 Request to send 33 Signal quality
2 Signalin rate indicator 10 Local Loopback 18 Test mode 26 Receive timiing 34 New signal
3 N/C 11 Data mode 19 Signal ground 27 Clear to send 35 Terminal timing (B)
4 Send data 12 Terminal ready 20 Receive common 28 Terminal to service 36 Standby/indicator
5 Send timing 13 Receiver ready 21 N/C 29 Data mode 37 Send Common
6 Receive data 14 Remote loopback 22 Send data 30 Terminal ready      
7 Request to stand 15 Incoming call 23 Send timing 31 Receiver ready      
8 Receive timing 16 Select frequency 24 Receive data 32 Select standby     
   
 
 
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