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儀表設(shè)備的485口定義如下： 1 Shield Shield / operational ground 2 - 3 A RS485 connection pin A 4 RTS Directions control RTS (TTL level) 5 GND1 Ground to VCC1 6 VCC1 Supply voltage +5V DC (max. 100 mA, supply voltage for terminating resistors) 7 - 8 B RS485 connection pin B 9 - 與CS1W-SCB41的485口（兩線制）怎樣接線？請(qǐng)回答一下，好嗎？