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User Manual
There are software packages available (i.e. SerialIP Redirector by Tactical Software) that can create a virtual serial port
on a PC. This virtual serial port can be configured to connect to a XYR301-E serial port. Standard programs can then
be used to access this serial port as if it were actually connected to the PC. Alternatively Hyperterminal may be used to
connect to a serial port on the XYR301-E. When creating the Hyperterminal connection, select "Connect Using: TCP
IP (Winsock)", enter the IP address of the XYR301-E, and the port selected in the "Network port" field.
Modbus TCP to RTU Gateway
The Modbus TCP to RTU Gateway allows an Ethernet Modbus/TCP Client (Master) to communicate with a serial
Modbus RTU Slave. The XYR301-E makes this possible by internally performing the necessary protocol conversion.
The conversion is always performed by the XYR301-E which is directly connected to the Modbus serial device (i.e.
only this module needs to have Modbus TCP to RTU Gateway enabled).
LAN
The above example demonstrates how a Modbus/TCP Client (Master) can connect to one or more Modbus RTU (i.e
serial) Slaves. In this example the XYR301-E Access Point is configured with the "RS232 Modbus/TCP to RTU
Gateway" enabled. Once enabled, the gateway converts the Modbus/TCP queries received from the Master into
Modbus RTU queries and forwards these over the RS232 port to the Slave. When the serial response to the query
arrives from the Slave, it is converted to a Modbus/TCP response and forwarded via the network to the Modbus/TCP
Master. If no response was received serially by the XYR301-E within the configured Response Timeout, the XYR301-
E will initiate a number of retries specified by the configured Maximum Request Retries.
The Modbus TCP to RTU Gateway may be configured to operate on either the RS-232 or RS-485 port.
34-XY-25-41
Client
Modbus TCP
Client (Master)
XYR301E Wireless Ethernet
Access Point
RS232
Modbus TCP
to RTU
Gateway
RS232
Modbus RTU
Slave
Page 47
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