It's suitable for intelligent building,clean room,workshop,agricultural greenhouses,storage, ... velocity is optional,that are 1200b/s, 2400b/s, 4800b/s, 9600b/s, 19200b/s,default data is 9600b/s.4) Comply with the protocol standard of ... two ways:A) Master/slave transmission;B) Slave/Master transmission;4) All the transmission communications in the communication loop of RS485 ...