User Manual

Modbus TCP Setup Submenu
Use the Modbus TCP Setup pages to specify the network address and optional device parameters of a remote Modbus/TCP device.
Example remote Modbus/TCP devices may include another Gateway device or any remote device using Modbus/TCP to communicate.
Devices
Use the Devices page to set up the network address and optional device parameters for a remote Modbus/TCP device that is linked to for
remote input and/or output.
Map the remote Modbus/TCP device’s input and/or output using the Client Read and Client Write Maps.
Connection Status. Connection status displays a non-zero error code when a socket error occurs. Possible errors include:
• 104 - Connection reset by peer
• 111 - Connection refused
• 113 - Connection aborted
• 114 - Network is unreachable
• 116 - Connection timed out
• 118 - Host is unreachable
• 119 - Connection in progress (connect unsuccessful and still trying)
• 205 - Could not get host IP by name
Default
Poll Peri-
od
The polling period defines how often, in sec-
onds, this device (GatewayPro or Ethernet
Bridge) contacts the device listed and solicits
data.
Domain
Name
The system may also look up an IP address
when given a domain name. If the IP address
is set to zero, the system attempts to find the
host by name.
IP Ad-
dress
Specify the IP address of the remote Modbus/
TCP device.
Local
Name
The local name is an optional field and is used
to refer to this device in other Web Configura-
tor pages.
Port If port is left set to zero, port 502 is used. To
use a non-standard port number, enter the
number.
Swap
Double
Regis-
ters
The term swapped applies only to double or float
formats. Modbus registers are, by definition, 16
bits of data per register. Access to 32-bit data,
either 32-bit integer (double) or IEEE 754 float-
ing point (float), is supported using two consecu-
tive registers. Modbus protocol is inherently “big
endian,” therefore Modbus defaults to having the
high order register first for double and float for-
mats. If the low order register comes first on the
accessed device, check the Swapped box.
If you have Swapped incorrectly, check the data.
When floating point data is reversed, a 1.0 be-
comes 2.2779508e-41, which rounds to zero. A
floating point 1.1 becomes negative 107609184.
If 32-bit integer data is reversed, 1 becomes
65536.
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