Tool/software:
Hi,
I use SN65HVD72, SN74LVC2G14DBV & ISO3086TDW design a isolated RS485 interface between my IPC & device(laptop).
But unfortunately my design only working in one direction, IPC to device.
I test by using Tera term and found that there is no communication from device to IPC.
Hello Lee,
Thank you for reaching out. At first glance, I think this is an issue with how RE/ and DE are tied together. These pins are commonly tied together in many applications on order ensure that the ISO3086T is either transmitting or receiving. In order to enable communication from device to PC please make sure that DE is enabled using a high or "1" (RE/ will be enabled on a low or "0").
Let me know if this fixes your issue.
Best,
Andrew
Hi Andrew,
Thank you very much for the reply.
IPC communication to device OK,
R =1.9V, RE =DE =3V , D= 400mV
when communicate from device to IPC, A & B receive signal from device.
But there is no any respond of pin R, RE, DE & D.
R=1.9V, RE=DE=3V, D=400mV
Look like my circuit design always stay at IPC to device stage.
Thank you.
Best regards,
Ku
Hi Andrew,
basically my circuit design was follow Dual Isolated Half-Duplex RS-485 Repeater as reference.
the only different was both ISO3082DW ic i change to SN65HVD72 and ISO3086T ic.
Best regards,
KU
Hi Andrew,
according to ISO3082 reference design summary features, these design data rate up was to 100kbps .
The data rate i set in tera term was 9600.
ISO3082 design feature:
So in order to change the ISO3082 ic to ISO3086TDW ic for my design.
i need to reconsider all the value of resistor and capacitor of my circuit to cope with ic ISO3086TDW?
