Pool Boiler Temperature Controller: Difference between revisions
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* The main valve (MV) is active. | * The main valve (MV) is active. | ||
* The boiler temperature is below the second stage threshold (timing rules apply). | * The boiler temperature is below the second stage threshold (timing rules apply). | ||
== Eurotherm 3508 == | == Eurotherm 3508 == | ||
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* The <b>Triple Contact Input</b> module provides three switch inputs. TBD: What is the "common" pin connected to? | * The <b>Triple Contact Input</b> module provides three switch inputs. TBD: What is the "common" pin connected to? | ||
== Network Interfaces == | |||
There are two digital communication (also referred to here as "network interfaces") on the Eurotherm 3508. | |||
==== Port H ==== | |||
The <b>Port H</b> interface was factory-configured for Profibus with a Eurotherm Profibus Comms card (AH026222U002). A 9-pin D-sub connector (part number PROF9PIND) provides access to RS-485 compatible signaling on pin #3 (Tx/Rx +Ve) and pin #8 (Tx/Rx -Ve) along with GND on pin #5. The iTools software allows configuring the Profibus interface to speak MODBUS, thereby allowing it to become the primary software configuration interface (freeing up <b>Port J</b> for system-level communication). | |||
==== Port J ==== | |||
The <b>Port J</b> interface is configured for RS-485 MODBUS communication at 19.2 kbps 8N1. | |||