Serial Communications Port - Exlar EXP-24 Manual De Instalación Y Servicio

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 cable 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
EXP 24 Manual
PN 47676
Revision H
Terminal
J24
J22
J25
J23
Serial Communication RS 485 Circuit
54
EXP 24 Isolated RS 485 Circuit
1/9/14
Exlar Corporation
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