Dear all,

i have pc with os mikrotik and connect it to modem 56k robotics with rs-232 and it works. but if the modem i try to connect with routerboard 500 cpu mipsle versi 2.9.51 or 3.13 it falied. any guess why?

thx,
Ferry

It might be because the Routerboard has no hardware handshake lines (RTS/CTS) ?? It depends on the exact model, but various boards do not have RTS/CTS lines only software handshaking. So maybe the RS232 buffer is overflowing and causing data corruptions?