Signal DB78 Pin Number DB9 Pin Number DB25 Pin Number RTS1+ 1 1-2 1-4 RTS1- 2 1-3 1-19 CTS2+ 3 2-4 2-5 CTS2- 4 2-5 2-13 SIN2- 5 2-7 2-16 SIN2+ 6 2-6 2-3 CTS1- 7 1-5 1-13 CTS1+ 8 1-4 1-5 SIN1+ 9 1-6 1-3 SIN1- 10 1-7 1-16 RTS2+ 11 2-2 2-4 RTS2- 12 2-3 2-19 SOUT1- 13 1-9 1-14 SOUT1+ 14 1-8 1-2 SOUT2+ 15 2-8 2-2 SOUT2- 16 2-9 2-14 CTS3+ 17 3-4 3-5 CTS3- 18 3-5 3-13 SIN3+ 19 3-6 3-3 SIN3- 20 3-7 3-16 CTS4+ 21 4-4 4-5 CTS4- 22 4-5 4-13 SIN4+ 23 4-6 4-3 SIN4- 24 4-7 4-16 RTS3+ 25 3-2 3-4 RTS3- 26 3-3 3-19 SOUT3+ 27 3-8 3-2 SOUT3- 28 3-9 3-14 SOUT4+ 29 4-8 4-2 SOUT4- 30 4-9 4-14 RTS4+ 31 4-2 4-4 RTS4- 32 4-3 4-19 CTS5+ 33 5-4 5-5 CTS5- 34 5-5 5-13 RTS5+ 35 5-2 5-4 RTS5- 36 5-3 5-19 SIN5- 37 5-7 5-16 SIN5+ 38 5-6 5-3 SOUT5+ 39 5-8 5-2 SIN8+ 40 8-6 8-3 SIN6+ 41 6-6 6-3 SIN6- 42 6-7 6-16 CTS6+ 43 6-4 6-5 CTS6- 44 6-5 6-13 RTS6+ 45 6-2 6-4 RTS6- 46 6-3 6-19 SOUT6+ 47 6-8 6-2 SOUT6- 48 6-9 6-14 CTS7+ 49 7-4 7-5 CTS7- 50 7-5 7-13 SIN7+ 51 7-6 7-3 SIN7- 52 7-7 7-16 RTS7+ 53 7-2 7-4 RTS7- 54 7-3 7-19 SOUT7+ 55 7-8 7-2 SOUT7- 56 7-9 7-14 CTS8+ 57 8-4 8-5 CTS8- 58 8-5 8-13 SOUT5- 59 5-9 5-14 SIN8- 60 8-7 8-16 RTS8- 61 8-3 8-19 RTS8+ 62 8-2 8-4 SOUT8- 63 8-9 8-14 SOUT8+ 64 8-8 8-2 GND 65 Shell Shell GND 66 Shell Shell GND 67 Shell Shell GND 68 Shell Shell GND 69 Shell Shell GND 70 Shell Shell GND 71 Shell Shell GND 72 Shell Shell GND 73 Shell Shell GND 74 Shell Shell GND 75 Shell Shell GND 76 Shell Shell GND 77 Shell Shell GND 78 Shell Shell