What is a 9 pin connector used for?

Related questions

1. What is rs485 Modbus?
2. Can I connect rs422 to rs485?
3. Does rs485 need termination?
4. What is a RS 485 cable?
5. What is Rs 485 used for?
6. How many wires is rs485?
7. What is the voltage level of rs485?
8. What is rs485 communication cable?
9. What is difference between rs232 and rs485?
10. What is the use of rs485?

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19. #connectors