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+The F4 temperature controller communicates using RS-232 and is compatible with Modbus. It operates at a baud rate of 19200.
+
+https://www.watlow.com/products/controllers/temperature-and-process-controllers/series-f4-process-controller
+https://www.automationdirect.com/adc/overview/catalog/field_i-z-o/protos_x_i-z-o
+https://www.cszindustrial.com/portals/1/pdf/WatlowF4_UserManual.pdf