UPS 250 and UPS 300 Uninterruptible Power Supplies Caterpillar


Device Bus Network

Usage:

UPS 250 APZ


Modbus

Modbus allows monitoring of the system via an RS-485(RTU) serial connection or an ethernet TCP interface when the UPS is equipped with the "Ethernet" option.

Note: The Modbus Field Option requires System Input/Output Daughter Board (SIOD).

Note: The operating parameter that is used to enable the Modbus must be set by Caterpillar for any of the configurations (Modbus). Look at the "Show Configuration" page on the LCD display or type "CTRL-N" from UPS View in order to verify that Modbus is enabled. Contact Caterpillar Field Service if the system is not enabled.

The type of connection can be either Modbus TCP (Ethernet) or Modbus RTU (RS485 serial). The following types of RS485 connections are supported: Half Duplex (2-wire) and Full Duplex (4-wire).

Note: Each MMU must have a unique ID number when Modbus RTU is used.

Setup

Use UPS View in order to set up Modbus. Use the following procedure in order to set up the UPS View password.




    Illustration 1g00856208

  1. Refer to Systems Operation, RENR9558, "Communication Connections" for information on loading software.

    A screen that is similar to Illustration 1 will appear after the software is loaded.

  1. Select the "Enter Password" menu option in this screen.



    Illustration 2g00787622

  1. Enter a valid username. Enter a valid password. Click on "OK". Refer to Illustration 2.

Modbus/TCP Ethernet and Modbus

Note: "Set Network Enable" option and "Set Modbus Enable" are factory settings.




    Illustration 3g00934343

  1. Select "Network Configuration" from the "UPS Settings" tab. Set the following items according to your network: "IP Address", "Default Gateway" and "Subnet Mask".

    Note: See your Network Administrator for these settings.

Modbus/TCP




    Illustration 4g00934345

  1. Set "Modbus TCP/2W/4W" to a value of "0" for Modbus/TCP.

    Note: Modbus/TCP uses standard port 502.

Half Duplex (2-wire)




    Illustration 5g00934345

  1. Set "Modbus TCP/2W/4W" to a value of "1" for "Half Duplex".



    Illustration 6g00934347



    Illustration 7g00934348

  1. Set "Modbus Unit ID".

    The range is from 1 to 247.




    Illustration 8g00934350

  1. Set "Modbus Baud Rate" to a value of 9600 baud or 19200 baud.



    Illustration 9g00934374



    Illustration 10g01241095

    Modbus/RTU - Half Duplex Wiring Diagram

  1. Put jumper "JMPA" to the "RS485" position on connector "J1".

    Note: Connector "J1" is located on the System Input/Output Daughter Board (SIOD).

  1. Connect a jumper wire between terminal 2 and terminal 3.

  1. Connect terminal 2 and terminal 3 to the positive terminal of the equipment that is being monitored.



    Illustration 11g00934354

  1. Connect a jumper wire between terminal 4 and terminal 5.

  1. Connect terminal 4 and terminal 5 to the negative terminal of the equipment that is being monitored.

  1. Connect terminal 1 and/or terminal 6 to the ground of the equipment that is being monitored.

Full Duplex (4-wire)




    Illustration 12g00934345

  1. Set "Modbus TCP/2W/4W" to a value of "2" for "Full Duplex".



    Illustration 13g00934347



    Illustration 14g00934348

  1. Set the "Modbus Unit ID".

    The range is from 1 to 247.




    Illustration 15g00934350

  1. Set "Modbus Baud Rate" to a value of 9600 baud or 19200 baud.



    Illustration 16g00934374



    Illustration 17g01241135

    Modbus/RTU - Full Duplex Wiring Diagram

  1. Put jumper "JMPA" to the "RS485" position on connector "J1".

    Note: Connector "J1" is located on the System Input/Output Daughter (SIOD) Board.

  1. Connect terminal 2 to the "RX+" terminal of the equipment that is being monitored.

  1. Connect terminal 4 to the "RX-" terminal of the equipment that is being monitored.

  1. Connect terminal 3 to the "TX+" terminal of the equipment that is being monitored.

  1. Connect terminal 5 to the "TX-" terminal of the equipment that is being monitored.

  1. Connect terminal 1 and/or terminal 6 to the ground of the equipment that is being monitored.

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