B&B Electronics Vlinx Serial Servers ESP902E Dokumentacja Pobierz pdf (Strona 17)

Documentation Number: ESP902-2303 Manual Chapter 2 13

B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104

B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445

RS-485 Connections

Some RS-485 devices are marked opposite from the RS-485 standard which

defines the Data B line as positive relative to Data A during a Mark state

before enabling the transmitter, and after transmitting before tri-stating. If the

RS-485 devices don’t respond, try swapping the Data B and Data A lines.

If you want to connect 4-Wire RS-485 devices, you can use the RS-422 Mode

provided that the ESP902 will be connected as a Master in a single master

system. If you have multiple masters, you cannot use this device, it does not

tri-state the transmitter in RS-422 mode.

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B&B Electronics Vlinx Serial Servers ESP902E Dokumentacja Strona 17