text: Modbus RS485 Digital IO - Helix Energy Transfer
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  Modbus RS485 Digital IO
  A versatile family of Modbus RS485 sensor monitoring modules. A Digital I/O signal solution is available for many contact monitoring applications. The supply voltage range is a wide 10 to 30Vdc (DIN rail unit 5Vdc). As well, it has Modbus compatibility with a number of available software options.
  Categories: Digital IO, RS485 Tag: Modbus RS485 Digital IO
  You should consider D series Modbus RS485 Digital IO modules. Because they let you read contacts with spare Modbus RS485 ports for status monitoring.
  Modbus RS485 Contact Monitoring
  The D series is a versatile family of Modbus RS485 I/O modules. Because a Digital I/O solution is available for many contact monitoring and actuation applications. The supply voltage range is a wide 10 to 30Vdc (DIN rail unit 5Vdc), as well as Modbus compatibility with a number of software options.
  When you have spare a spare RS485 port, and need to add contact monitoring, use D series contact monitoring modules. Because D series Modbus RS485 Digital I/O modules allow the simple monitoring of industry standard contacts. They use the standard Modbus protocol. So you can easily connect your existing sensing devices to modern control systems. They are a simpler way to add sensor measurement to a RS485 bus than other types. Because they read common sensor signals, they are in many cases used in HVAC systems, refrigeration systems, chillers, environmental monitoring, computer room monitoring, dryer, and a variety of other applications.
  When you need simple to use a Modbus RS485 contact monitoring module, use the D series. In other words D series Modbus RS485 Digital IO modules are a simple way to add contact monitoring to a RS485 bus.