version 2 1 9 .tran 1u 100u{return}.save all{return}.probe alli 8 2 I(XU2:3) 2 I(XU2:4) 2 I(XU3:3) 2 I(XU3:4) 1 V(RX) 1 V(TX) 1 V(U1RX) 1 V(U1TX)