Omega Products D6000 Installation Manual

D6000 SERIES

Digital Transmitters

Modbus RTU, RS-485 Output

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regulations that apply. OMEGA is constantly pursuing certification of its products to the European New
Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.

The information contained in this document is believed to be correct, but OMEGA accepts no liability for any
errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, human applications.

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Overview

All D6000 series modules contain an EEPROM (Electrically Erasable Programmable Read Only
Memory) to store setup information and calibration constants. The EEPROM replaces the usual
array of calibration potentiometers and DIP switches used to specify baud rate, address, parity,
etc. The memory is nonvolatile which means that the information is retained even if power is
removed. No batteries are used so it is not necessary to open the module case.

The EEPROM provides tremendous system flexibility allowing all of the module’s setup
parameters to be configured remotely through the communications port without having to
physically change a switch or turn potentiometers. There is one minor drawback in using
EEPROM instead of switches; there is no visual indication of the setup information in the module.
To overcome this, each module has an input pin labeled DEFAULT*. By connecting this pin to
Ground, the module is placed in a known communications state called Default Mode.

The Default Mode settings are: 9600 baud, one start bit, eight data bits, one stop bit, and no
parity. The module will only answer to Modbus Slave address “01” in the Default Mode.

Grounding the DEFAULT* pin does not change any of the setups stored in EEPROM. The setup
information may be read to determine all of the setup parameters stored in the module.

Setup information in a module may be changed at any time or while in the Default Mode. The
baud rate and parity setups may be changed without affecting the Default Mode values of 9600
baud and no parity. When the DEFAULT* pin is released, the module automatically performs an
internal reset and configures itself to the baud rate and parity stored in the setup registers.

The Default Mode should only be used with a single module connected to a computer in order to
prevent communications data collisions with other modules on the serial port.

Module Connections

The D6000 series module must be connected to an RS-485 serial port for configuration. See
Figure 1.0 below for an overview of the required connections. Figure 2.0 details connections
between a D6000 and a A1000. Figure 3.0 details connections between a D6000 and a USB­COMi RS-485 serial converter. Note: No connections are required on the analog or digital I/O
pins to perform the module configuration.

Figure 1.0 General Overview, Default Mode and RS-485 Serial Connection.

Figure 2.0 D6000 to A1000 RS-232 to RS-485 Serial Converter in Default Mode.

Figure 3.0 D6000 to USB-COMi RS-485 Serial Converter in Default Mode.