Sutron 8310 - Page 128

Sutron Corporation 8310 & 7310 Users Manual 8800-1125Rev. 2.7 (BETA) 4/16/2014 pg. 128
only COM4 has built-in RS485 support.
Station Setup/Communications/ MODBUSTCP
This menu is used to configure MODBUS SLAVE operation over TCP/IP. Note that “slave” operation
means the 8310 listens for commands to read and write local Modbus registers, taking action only when
a command is received from a Modbus “master”. Local registers are defined in measurement output
settings menus. See MODBUS for more information on how to define local registers.
MODBUSTCP
Enable Yes
Port 502
UseLAN Yes
End MODBUS Menu
Enable
This property determines whether MODBUSTCP services are enabled. When set to Yes, the 8310
listens for, and handles, MODBUS requests on the specified IP Port.
Port
This property identifies the IP Port on which the 8310 will listen for and handle MODBUS TCP
requests.
EnableLAN
When “Yes”, Modbus powers the LAN (if needed) so that TCP/IP traffic will be directed over its
interface. When “No”, the LAN is not powered, and ModbusTCP will attempt to another TCP/IP
interface, if available, e.g., GPRS. NOTE: if the LAN is powered and connected to a valid network,
its interface will always be favored and used over any other available TCP/IP interface.
Station Setup/Basic
The Station Setup/Basic menu contains the following items:
Satlink Selftimed
This item defines a Basic subroutine called when it’s time to format a Satlink self-timed
message. The basic program may alter the contents of the formatted message.
To create a selftimed formatting routine, create a function with a "SELFTIMED_" prefix. The
return value of the function becomes the buffer. For example:
Public Function SELFTIMED_STFormatter
Selftimed_STFormatter = "Test Selftimed Message"
End Function
It's possible to append to the buffer, as opposed to simply overwriting it, by taking advantage of
string concatenation. The following example appends its message to the current buffer: