... .001 Work with waveform pulse,contact switch,encoder(PNP or NPN) 4/6/8 digits display. 6 digits ... Various wave form pulse input,contact switch,encoder(NPN PNP) to used with available;widely used in line ... ,please indicate when ordering.5, RS232 or RS485 Modbus RTU protocol,connectable with various equipment ... ,computer or PLC directly.6, Power supply:regular: ...