Here is the VK45 serial port info, . I guess the VK45 port is not standard after all.
VK45___ PC
3------2 SD
5------3 RD
7------4 RTS
9------5 CTS
14-----20 DTR
15-----8 DCD
13-----7 SG
1------1 FRAME GND
Al
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CNC, Mechatronics Integration and Machine Design.
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