Title: +038=360.000-OU045T_03-PCD2.m4160 PLS SBC - Hardware Manual.pdf
A-2Saia-Burgess Controls Ltd.AnnexDefinitions of serial interfacesA.2.2 RS485/422Signals to RS485 (RS422)nicht aktivmarkspace5V= markz.B. Startbit4V3V/TXZ O V2.5V2VTXH O VL O V1V0VVOZ = VOH = VOL =0.9 V min ... 1.7 V 2 V min (with load) ... 5 V max (without load) -2 V ... -5 VIn the idle state, RS422 is in the “mark” positionRS422:Signal type Data signalLogical state 0 (space) 1(mark)Polarity TX positive to /TX /TX positive to TXControl/message signal0 (off) 1 (on)/RTS positive to RTS RTS positive to /RTSRS485:ASignal type Data signalLogical state 0 (space) 1(mark)Polarity RX-TX positive to /RX-/TX /RX-/TX positive to RX-TXNot all manufacturers use the same connection configuration, so the data lines may need to be crossed