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.
- 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.
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| Illustration 1 | g00856208 |
- Select the "Enter Password" menu option in this screen.
- Enter a valid username. Enter a valid password. Click on "OK". Refer to Illustration 2.
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| Illustration 2 | g00787622 |
Modbus/TCP Ethernet and Modbus
Note: "Set Network Enable" option and "Set Modbus Enable" are factory settings.
- 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.
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| Illustration 3 | g00934343 |
Modbus/TCP
- Set "Modbus TCP/2W/4W" to a value of "0" for Modbus/TCP.
Note: Modbus/TCP uses standard port 502.
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| Illustration 4 | g00934345 |
Half Duplex (2-wire)
- Set "Modbus TCP/2W/4W" to a value of "1" for "Half Duplex".
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| Illustration 5 | g00934345 |
- Set "Modbus Unit ID".
The range is from 1 to 247.
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| Illustration 6 | g00934347 |
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| Illustration 7 | g00934348 |
- Set "Modbus Baud Rate" to a value of 9600 baud or 19200 baud.
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| Illustration 8 | g00934350 |
- Put jumper "JMPA" to the "RS485" position on connector "J1".
Note: Connector "J1" is located on the System Input/Output Daughter Board (SIOD).
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| Illustration 9 | g00934374 |
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| Illustration 10 | g01241095 |
Modbus/RTU - Half Duplex Wiring Diagram | |
- Connect a jumper wire between terminal 2 and terminal 3.
- Connect terminal 2 and terminal 3 to the positive terminal of the equipment that is being monitored.
- Connect a jumper wire between terminal 4 and terminal 5.
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| Illustration 11 | g00934354 |
- Connect terminal 4 and terminal 5 to the negative terminal of the equipment that is being monitored.
- Connect terminal 1 and/or terminal 6 to the ground of the equipment that is being monitored.
Full Duplex (4-wire)
- Set "Modbus TCP/2W/4W" to a value of "2" for "Full Duplex".
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| Illustration 12 | g00934345 |
- Set the "Modbus Unit ID".
The range is from 1 to 247.
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| Illustration 13 | g00934347 |
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| Illustration 14 | g00934348 |
- Set "Modbus Baud Rate" to a value of 9600 baud or 19200 baud.
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| Illustration 15 | g00934350 |
- Put jumper "JMPA" to the "RS485" position on connector "J1".
Note: Connector "J1" is located on the System Input/Output Daughter (SIOD) Board.
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| Illustration 16 | g00934374 |
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| Illustration 17 | g01241135 |
Modbus/RTU - Full Duplex Wiring Diagram | |
- Connect terminal 2 to the "RX+" terminal of the equipment that is being monitored.
- Connect terminal 4 to the "RX-" terminal of the equipment that is being monitored.
- Connect terminal 3 to the "TX+" terminal of the equipment that is being monitored.
- Connect terminal 5 to the "TX-" terminal of the equipment that is being monitored.
- Connect terminal 1 and/or terminal 6 to the ground of the equipment that is being monitored.