Technical data

RS-485 Connections
76 Appendix C Manual Documentation Number: ESP904-4513m
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone] – www.bb-elec.com
B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone] – www.bb-europe.com
To connect 4-Wire RS-485 devices, the RS-422 Mode can be used provided
the ESP904 will be connected as a master in a single master system. If using
multiple masters, the ESP904 cannot be used, as it does not tri-state the
transmitter in RS-422 mode.