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DH3 WIRELESS GATEWAY
USER GUIDE
Modbus Module
- Used when a port on a receiver is set to Modbus Master mode. Used to read and
write values to a Modbus Slave device.
Modbus Slave
- A device in a Modbus network takes action from a Modbus Master device and responds
to it.
Node
- term used to identify a System Transmitter, configured to communicate with a System Gateway.
Node Timeout
- Transmitter setting that specifies the number of minutes the node checks for radio-
frequency activity. If it does not detect radio-frequency activity within this period, it registers a Read
Timeout error.
Normally Closed
- Digital contact that is closed in normal state.
Normally Open
- Digital contact that is open in normal state.
Output Window
- shows messages and data associated with various tasks.
Outputs
- Values used to source outputs on a device such as analog output, discrete output, or Modbus
write registers.
Parity
- A bit added to a binary code that indicates parity and is used to check the integrity of data. A
parity bit is used as the simplest form of error detecting code.
PLC
- Programmable Logic Controller.
Port
- Communications Port ID on computer used to configure devices.
Pressure Transducer
- Device used to convert pressure to an analog value.
Product (Level)
- Top level of fluid in tank such as oil. Represented by the position of the top float on a
digital liquid level sensor.
Project Explorer
- Window in the BreeZ® Software that shows a tree of the devices in a project file. The
name of the project file (current site) appears at the top of the tree, followed by the Wireless Gateway
associated with the project file. Transmitters and Modules are grouped below the Wireless Gateway to
which they are assigned.
Project File
- Site specific project configuration set up and saved using BreeZ® software.
Project Name
- Name assigned to field site specific project set up and saved using BreeZ® software.
Pulsed
- The discrete output will change state for a specified period of time determined by a Modbus
master via a Modbus register write. The value written will be in milliseconds.
Range
- Max decimal value to be represented by full scale of analog input.
RAW Units
- Digital representation of an analog signal.
Refresh Time
- Count that increases every one (1) second. The count is posted each time the
corresponding device completes a successful transmission. An unchanging refresh time indicates a
failure of the corresponding device.
Relay
- A device, usually consisting of an electromagnet and an armature, by which a change of current
or voltage in one circuit is used to make or break a connection in another circuit or to affect the
operation of other devices in the same or another circuit.
Retries
- Number of times the device will send data in the event of a transmission failure before
terminating transmit attempts.
RF Timeout
- diagnostic indicator for radio communication. To use this value, set the Node Timeout in
transmitter's radio setting to double that of the Reading Interval time plus 10 seconds.
RS485
- Telecommunications standard for binary serial communications between devices. RS485 allows
for serial connections between two or more than devices on a networked system.
RS485 Port
- RJ45 Jack located on top of Base Unit and Modules, used to communicate Modbus via
RS485 protocol.
RTS
- Ready To Send (232 mode).
RTU
- Remote Terminal Unit.
RTU Port
- Green terminal ports on Base Unit & DH2, used to communicate Modbus via RS485 or RS232
protocol.
RX
- Receive (RS232 mode).
RX-
- Receive Minus (RS485 mode).
RX+
- Receive Plus (RS485 mode).
Scaled Units
- Used to convert an analog signal into desired values.
Single Float (Configuration)
- Liquid Level Sensor or High Level Switch Sensor set up with one float to
read either level liquid levels or for alert notification.
Site
– Field location where devices are deployed for use.
Site ID
– Unique, customer assigned identification for site location.
Slave ID
- ID of the slave device in which Modbus Registers are being requested.
