The Modbus option requires a system I/O daughter card (SIOD). The SIOD is located in the system I/O PWA (SIO). The SIO is located in each multi-module system MMS, multi-module unit MMU flywheel cabinet or SMS flywheel cabinet. Also, the operating parameter must be enabled to utilize the Modbus configurations.
Multi-Module Systems (MMS) can be connected to the Modbus as one system or as individual flywheel Units, depending on the type of data desired.
To verify that the Modbus is enabled, view the configuration on the UIF on the front of the system cabinet or type "CTRL-N" from UPSView. If the system is not enabled, contact the technical communicator.
As shown in Illustration 1, each MMU system has data. the data is detailed. The data is specific to the particular MMU. The descriptions of MMU detailed data and system data are given in RENR9988, "Modbus Register Map".
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| Illustration 1 | g03428394 |
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System connections | |
System data is communicated between the MMUs via an internal serial communication channel and is available from any MMU. Detailed MMU data is only available from the specific MMU. For example, MMU2 detailed data is only available from MMU2. To obtain all of the available data from an MMS, a UPS requires that each MMU is connected to the Modbus.
The Modbus can be connected either by TCP (Ethernet) or RTU (RS485 serial). Two types of RS485 connections are supported, half duplex (2-wire) and full duplex (4-wire).
Note: Each MMU must have a unique ID when using Modbus RTU.
- Log into UPSView with a valid user name and password.
- In UPSView, set "Modbus TCP/2W/4W" to "1" for 2-wire operation under menu item:
"Op. Params. > Internal CAN Enable > Modbus TCP/2W/4W"
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Illustration 2 g01273448 Modbus TCP/2W/4W - Set the "Modbus Unit ID". The "Modbus Unit ID" must be different for each MMU.
"Op. Params. > Internal CAN Enable > Modbus Unit ID"
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Illustration 3 g01273454 Modbus Unit ID - Set the "Modbus Baud Rate" to "9600" or "19200" baud:
"Op. Params. > Internal CAN Enable > Modbus Baud Rate"
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Illustration 4 g01273462 Modbus baud rate - On the SIOD, set jumper JMPA to the "RS485" position.
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Illustration 5 g01273465 Jumper JMPA Show/hide table
Illustration 6 g01273467 Modbus 2 wire wiring diagram - Connect a jumper wire between terminals 2 and terminal 3.
- Connect terminals 2 and 3 to the positive terminal of the monitoring equipment.
- Connect a jumper wire between terminals 4 and 5.
- Connect terminals 4 and 5 to the negative terminal of the monitoring equipment.
- Connect terminal 1 and/or 6 to the ground of the monitoring terminal
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| Illustration 7 | g01273472 |
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SIOD board with jumpers connected. | |
| J1 Pinout: | Modbus TCP/2W/4W settings: |
| 1: RS485 Ground | 1: Modbus/RTU, Half duplex |
| 2&3: RS485 TX/RX + | |
| 4&5: RS485 TX/RX - | |
| 6: RS485 Ground |
- Log into UPSView with a valid user name and password.
- In UPSView, set "Modbus TCP/2W/4W" to "2" for 4-wire operation under the following menu choice:
"Op. Params. > Internal CAN Enable > Modbus TCP/2W/4W"
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Illustration 8 g01273493 Modbus TCP/2W/4W - Set the "Modbus Unit ID". The "Modbus Unit ID" must be different for each MMU 1-247:
"Op. Params. > Internal CAN Enable > Modbus Unit ID"
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Illustration 9 g01273514 Modbus Unit ID - Set the "Modbus Baud Rate" to "9600" or "19200" baud:
"Op. Params. > Internal CAN Enable > Modbus Baud Rate"
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Illustration 10 g01273515 Modbus baud rate - On SIOD, set jumper JMPA To the "RS485" position on SIOD connector J1.
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Illustration 11 g01273523 Jumper JMPA Show/hide table
Illustration 12 g01273525 Modbus 4 wire wiring diagram - Connect terminal 2 to the (RX+) terminal of the monitoring equipment.
- Connect terminal 4 to the (RX-) terminal of the monitoring equipment.
- Connect terminal 3 to the (TX+) terminal of the monitoring equipment.
- Connect terminal 5 to the (TX-) terminal of the monitoring equipment.
- Connect terminal 1 and/or 6 to the ground of the monitoring terminal.
