User manual
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Cooper Bussmann 245U-E Wireless Ethernet Modem & Device Server User Manual
51Rev Version 2.19
Enable Modbus TCP
Server (Slave)
Select this checkbox to enable the onboard Modbus TCP server. All Modbus TCP
connections to the module IP address and specified Modbus server device ID will be
routed to the onboard I/O registers.
Modbus Server
Device ID
Specify the Modbus device ID for the onboard Modbus TCP server. Allowed values
are 0 to 255.
Enable Modbus TCP
Client (Master)
Select this checkbox to enable the onboard Modbus TCP client. I/O to be transferred
via the Modbus TCP client is specified with Modbus TCP client mappings.
Modbus Client Scan
Rate
Enter the delay (in milliseconds) between execution of consecutive Modbus TCP
client mappings to the same server.
Reset Registers on
Comms Fail
When enabled, the value in any onboard I/O register will be reset to zero if a valid
Modbus transaction directed to or from the given register has not been completed
for longer than the Comms Fail Timeout.
Comms Fail Timeout The period of time after which onboard I/O registers will be reset if a valid Modbus
transaction directed at that register has not completed.
Enable Modbus
Statistics
Enables the Modbus diagnostic registers, as shown in “4.9 Internal Diagnostics
Modbus Registers.” Disabling this option will free up the registers and also slightly
increase processing resources.
Log background
Noise
RSSI and BGND on RX messages are made available in the diagnostic registers
See “4.9 Internal Diagnostics Modbus Registers” for details. For a hexadecimal
value of 5F5D, the 5D byte = RSSI and the 5F byte = BGND. Convert the value from
hexadecimal to decimal and add a “-” (for example, 5F = -95dB). Enabling this option
removes the background noise byte from these registers so that only the RSSI value
is made available.
Modbus TCP Client Mappings on I/O Transfer Menu
Local Register Enter the starting onboard I/O register number that the specified Modbus master
transaction will transfer I/O to/from.
I/O Count Specify the number of consecutive I/O register to be transferred for the specified
transaction.
Function Code Specify the Modbus function code for the transaction.
Destination Register Enter the starting I/O register number in the destination device that the specified
Modbus master transaction will transfer I/O to/from.
Device ID Enter the Modbus device ID of the destination Modbus device
Server IP Address Specify the IP address of the destination Modbus TCP server for the specified
transaction.
Response Timeout Enter the timeout (in milliseconds) to wait for a response to the specified transaction.
Comm Fail Register Enter the onboard I/O register number to store the communication status of the
specified transaction. The specified register will be set to 0 if communications is
successful, 0xFFFF if there is no connection to the specified server, or 0xFFxx where
“xx” is the Modbus exception code
3.16 Roaming
In certain cases a client may be in a mobile situation and require a method of roaming to another access point.
Normal network communications provide only basic roaming behavior, which means as the client moves further
from the access point it will go through a period of poor communication followed by a complete disconnection of
the radio link. It is at this point that the client will scan for access points, and if one is in range it could take up to
10seconds for the client to establish a connection.