User`s guide

Chapter 4 IA Profiles and Procedures 45
system, and communicates only with devices on COM ports.
Locating Setup Information
• To configure the serial port for Modbus ASCII or Modbus RTU, see
"Configuring a Serial-Connected Slave: Generic Procedure" on
page 49.
• To setup a PC and the device server for COM port redirection using
RealPort, see "Setting Up COM Port Redirection" on page 52.
Modbus Profile: Serial-Connected Master
About This Profile
Use this profile to connect a master device using Modbus RTU or Modbus
ASCII to the serial port of the device server.
Configuration Options
The serial port connection must be configured for the protocol required by
the master, in this case Modbus RTU or Modbus ASCII. If the remote slave
supports TCP socket communication, which is the case if the remote slave
is connected to another device server, Digi recommends this option.
Modbus/TCP is the other supported network option. This master can be
configured to control up to 8 slaves.
Locating Setup Information
• To configure the port for Modbus ASCII or Modbus RTU and the
network for TCP socket communication, see "Configuring a Serial-
Connected Master: TCP/UDP Sockets" on page 50.
• To configure the port for Modbus ASCII or Modbus RTU and the
network for Modbus/TCP, see "Configuring a Serial-Connected
Master: Generic Procedure" on page 50.