Reference and Sources: 
EIA/TIA-232 DTE Cable Pinout (DB60 to DB25) | 60 Pin1 | Signal | Description | Direction | 25 Pin | Signal | J1-50
J1-51
J1-52 | MODE_0
GND
MODE_DCE | Shorting group | - | - | - | | J1-46 | Shield GND | Single | - | J2-1 | Shield GND | J1-41
Shield | TxD/RxD
- | Twisted pair no. 5 | -->
- | J2-2
Shield | TxD
- | J1-36
Shield | RxD/TxD
- | Twisted pair no. 9 | <--
- | J2-3
Shield | RxD
- | J1-42
Shield | RTS/CTS
- | Twisted pair no. 4 | -->
- | J2-4
Shield | RTS
- | J1-35
Shield | CTS/RTS
- | Twisted pair no. 10 | <--
- | J2-5
Shield | CTS
- | J1-34
Shield | DSR/DTR
- | Twisted pair no. 11 | <--
- | J2-6
Shield | DSR
- | J1-45
Shield | Circuit GND
- | Twisted pair no. 1 | -
- | J2-7
Shield | Circuit GND
- | J1-33
Shield | DCD/LL
- | Twisted pair no. 12 | <--
- | J2-8
Shield | DCD
- | J1-37
Shield | TxC/NIL
- | Twisted pair no. 8 | <--
- | J2-15
Shield | TxC
- | J1-38
Shield | RxC/TxCE
- | Twisted pair no. 7 | <--
- | J2-17
Shield | RxC
- | J1-44
Shield | LL/DCD
- | Twisted pair no. 2 | -->
- | J2-18
Shield | LTST
- | J1-43
Shield | DTR/DSR
- | Twisted pair no. 3 | -->
- | J2-20
Shield | DTR
- | J1-39
Shield | TxCE/TxC
- | Twisted pair no. 6 | -->
- | J2-24
Shield | TxCE
- | Arrows indicate signal direction: --> indicates DTE to DCE, and <-- indicates DCE to DTE. 1 Any pin not referenced is not connected.
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