Endress+Hauser Fieldgate FXA42, Operating Instructions Manual, Page: 79 / 118

Fieldgate FXA42 Operation
Hauser 79
Parameters Description
Number Number of registers or coils to read or write.
If more registers or coils are read or written than fit into the selected data type, the value will
become an array. For more information on the number of registers or coils, see the
Limits
section.
Data type Data type of the value
Limits
Up to 128 values can be defined. As values can become arrays when reading and writing
several registers or coils, the following limit applies: The number of all scalar (non-array)
values plus the size of all arrays must not exceed 512.
Settings
A number of general settings can be configured using the fields below the value list:
Settings Description
Mode Defines whether to operate the device as a Modbus RTU slave or a Modbus TCP server. Depending on
the particular setting, 2 different groups of additional settings are available.
TCP settings
Settings Description
Port TCP port number where the Modbus TCP server will be listening. The number of the port is
generally 502.
Keep-alive enable Enables the TCP keep-alive mechanism for connections from clients. The keep-alive
mechanism is used to detect inactive connections. If an inactive connection is detected,
resources used by this connection can be released.
Keep-alive timeout Idle time in seconds after which the first keep-alive probe will be sent.
Keep-alive interval Interval in seconds in which keep-alive probes will be sent.
Keep-alive count Number of keep-alive probes that will be sent before closing the connection.
RTU settings
Settings Description
Address RTU slave's address
Baud rate Defines the baud rate for Modbus RTU
Parity Defines the parity (and number of stop bits) for Modbus RTU. Options:
• None (2 stop bits)
• Odd
• Even
Event log messages
The following section describes the messages that the Modbus slave driver may log to the
event log. All messages are prefixed with the text Modbus Slv driver .
Portal communication error <error code>
A general error has occurred while exchanging data with the port. Possible error codes:
Error code Description
-10 Out of memory
-12 Internal data queue overflow: data was produced faster than it could be processed.