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Connector pinout: RS422 - RS499 RS422 - RS499 COLFAX INTERNATIONAL At the DTE At the DCE pin name direction description color 1 GND ------ Shield Ground 2 SRI IN Signal Rate Indicator 3 n/c - Spare 4 SD OUT Send Data 5 ST OUT Send Timing 6 RD IN Receive Data 7 RTS OUT Request To Send 8 RR IN Receiver Ready 9 CTS IN Clear To Send 10 LL OUT Local Loopback 11 DM IN Data Modem 12 TR OUT Terminal Ready 13 RR IN Receiver Ready 14 RL OUT Remote Loopback 15 IC IN Incoming Call 16 SF/SR OUT Select Frequency/Select Rate 17 TT OUT Terminal Timing 18 TM IN Test Mode 19 GND ------ Ground 20 RC ------ Receive Twister-Pair Common 21 GND ------ Spare Twister-Pair Return 22 /SD ------ Send Data TPR 23 GND ------ Send Timing TPR 24 GND ------ Receive Timing TPR 25 /RS ------ Request To Send TPR 26 /RT ------ Receive Timing TPR 27 /CS ------ Clear To Send TPR 28 IS IN Terminal In Service 29 /DM ------ Data Mode TPR 30 /TR ------ Terminal Ready TPR 31 /RR ------ Receiver TPR 32 SS OUT Select Standby 33 SQ IN Signal Quality 34 NS OUT New Signal 35 /TT ------ Terminal Timing TPR 36 SB IN Standby Indicator 37 SC ------ Send Twister Pair Common