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The answer to your question is given on the blackbox page that you referenced pin your own modular adapter to connect your serial equipment the reason that they did not connect the rj11 connector to the db9 is that there is no standard way available. My skywatcher cable which should allow me to guide my scope from stellarium is rs232 to rj11 but i dont have a serial port on my laptop i do have usb ports though i do have usb ports though trying to find the right pinouts to make my own is turning into a nightmare. Amazoncom rs232 serial computer cable db9 9 pin female rj 11 rhamazoncom 216 fresh usb to serial wiring diagram wiring diagram wiring diagram rhbougetonilecom 739 db9f to rj11 306. From 1 is a interface for rs 232 from db 9s female to rj11 to telephone cable to rj11 to db 9p male it is not known whether this is any type of standard note that if this is accidentally connected to a telephone then one telephone wire is grounded and txd and rxd are no connect everything should survive. Home wiring diagram rs232 a rj11 rs232 a rj11 high quality ftdi usb rs232 cable usb a male rj11 male cable rj45 from rs232 a rj11 img source alibabacom rs232 a rj11 usb to rj11 find great deals on ebay for usb to rj11 in cables and connectors shop with confidence mhubx8 8 port rs485 repeater hub with rs232 port r e r e smith serial munication products is your rs485 rs232 and