Serial Communications Port - Curtiss-Wright XP-24 Bedienungsanleitung

Serial Communications Port

The EXP 24 provides one serial communication port for setup. The serial interface is a
two wire isolated RS-485 network. The EXP24 supports the Modbus RTU protocol for
access to all parameters. The Default baud rate is 19.2k. The default Modbus address is 1.
Always use 3 conductor cables to be sure the Serial Data Common is connected to all
other commons on the RS485 network. An on board terminating resistor is provided, one
side of the resistor is internally connected to Serial Data B, to connect the termination add a
jumper between Serial Data A (J 24) and Serial Term Res (J3). Termination is not usually
recommended at 19.2 k baud unless the RS 485 cable is longer than 1000 ft.
Function
Serial Data A (TX -)
Serial Data B (TX +)
Serial Data Common
Serial Data Term Resistor
Typical Host or 485 Converter
Serial Communication RS 485 Circuit
Curtiss-Wright | EXP-24
Terminal
J24
J22
J25
J23
EXP 24 Isolated RS 485 Circuit
Rev. P PN47676 8/17/17 68