想用做個(gè)RS485轉(zhuǎn)光纖通訊的電路,想問(wèn)問(wèn)有沒(méi)標(biāo)準(zhǔn)的轉(zhuǎn)換芯片可以實(shí)現(xiàn)DSP-芯片/外圍電路-光纖傳輸-PLC