Calta Computer Systems Limited

COMPANY PROFILE

Our company was incorporated in April 1981. Initially Calta provided custom solutions to a wide range of data communications applications. From these applications emerged a common set of requirements leading to the development of the product family described below. Today our focus is the supply of our standard products augmented by custom additions where dictated by unique customer requirements.

COMPANY PRODUCTS

• PLC09 Arbitrator - Modbus Interface

  This device permits a single ported PLC or other remote device to be connected to up to three Hosts. The device was designed for use with MODBUS but has been found to operate well with any poll/response protocol. In addition to the multiplexing aspect, the unit provides RTS control and buffering to overcome inter character delays which some systems will not tolerate.

• PLC09 Arbitrator - Allen-Bradley DF1 Interface

This device permits a single ported PLC or other remote device to be connected to up to three Hosts. The device was designed for use with Allen-Bradley Full or Half Duplex DF1 communication. In addition to the multiplexing aspect, the unit provides RTS control.

• MDBUS for Windows

  Mdbus is a software package running under Windows that provides an interface to devices utilizing MODBUS protocol.

  • The package provides the following features:
    
    • - Master mode
      • Poll a single Slave for data
    • - Host mode
      • Poll up to 32 different Slaves
    • - Slave mode
      • Useful for simulation or as a simple interface for remote Host data retrieval
      • Up to 1000 values can be changed with 1 DDE poke
      • Values sent to a host can be jogged for upset testing
    • - Monitor mode
      • View TX and RX data in hex
    • - DDE
      • Interface to Excel and other DDE compliant programs
      • The Excel Interface requires only the name of the spreadsheet and all values can be dumped automatically into Excel each scan
    • - Modbus RTU/TCP Communications
      • Interface via the Internet or Lan to devices or applications supporting the Modbus TCP/IP (RTU) protocol
    • - Addition of OPC Server Option
      • Mdbus is now available in two versions - one with OPC and one without

Note! - A time limited fully functional demo copy is available.
Click here to request a copy.

• DNBUS for Windows

Dnbus is a software package running under Windows that implements the MODBUS subset used in Daniel Industries 2500 protocol and has much the same features as Mdbus. In addition it is capable of polling for Archive data and storing it in Excel via DDE.

Note! - A time limited fully functional demo copy is available.
Click here to request a copy.

• PLC09 Modbus to Allen-Bradley DF1 Converter

This device provides a cost effective solution for the addition of a Modbus RTU Protocol port to an Allen-Bradley PLC5. The standalone PLC09 Converter communicates serially (ie. using Channel 0) with the PLC5. Mapping configuration information (Modbus registers to PLC5 files) is contained in an ASCII file which can be downloaded to the PLC09 via a dedicated serial port. In addition, the PLC09 provides another serial port which allows transparent sharing of the PLC5 port with another Host using DF1 protocol.

View the Modbus to DF1 Converter Operator's Manual in PDF format

• PLATOR

This device converts between different serial asynchronous protocols. By front ending foreign devices with the PLATOR they can be easily integrated into existing systems. A standard converter exists for MODBUS to Foxboro 760.

• XLATOR

  Standard communications hardware today employs UARTS supporting a maximum of 8 data bits per character. Some older systems such as L and N, TRW, and Bristol employ 32 bit long characters. The XLATOR, which is a single board computer, provides bi-directional conversion between the protocols producing four 8 bit bytes for each 32 bit character. This unit permits standard monitoring and diagnostic equipment to interface to 32 bit systems.

COMPANY SERVICES

Occasionally our standard product offerings do not meet a unique customer requirement. These unique applications can usually be serviced by incorporating the required special features into our standard product. Please contact us with your unique communications requirements.

• HMI Packages

• We have used both custom and standard communication drivers in conjunction with Microsoft Access and Microsoft Excel to produce custom Operator Interfaces. These packages produce a very cost effective interface for many applications.

Send E-Mail to Calta Computer Systems (ccompute@calta.com)            Skype Name - sydatwork

We can also be contacted as follows:

Calta Computer Systems Limited       Phone - 403-252-5094 
Suite 202, 7003 - 5th Street S.E.    Fax   - 403-252-5102
Calgary, Alberta, Canada             Attention: Lorne Schneider, P. Eng.
T2H 2G2                                         Sydney Deitch, P. Eng.