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Modbus RS-485 (optional on the SP1+ using the dry contact input)
MODBUS RTU is a non-proprietary serial communications protocol that is widely used in the process
control industry actuation.
SP1+ only supports pre order optional Modbus with the RJ45 connector (RTU) on the dry contact
input port. For just Modbus, only the pin 1 and 2 are used, being respectively, Modbus A/+ and
Modbus B/-.
Note: Modbus queries are slow (up to 3 seconds). This is per Modbus protocol definition, it’s not an
AKCP limitation. The more sensors you have, the bigger the polling interval must be.
Configuring the Modbus options and more information about this feature is explained in the separate
SP+ Modbus manual here;
http://www.akcp.in.th/downloads/Manuals/Modbus%20on%20SP+/SP+%20Modbus%20Manual.pdf
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