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Model: USB485
The eGauge USB485 is used to receive and send serial data between a RS485 serial chain and a host's USB port. Primarily it is used for compatible eGauge meters (EG4xxx Core and Pro) to record data from remote Modbus devices (such as inverters, temperature sensors, and other meters), or for other systems (such as a building automation system or other data loggers) to read data from the eGauge via Modbus RTU.
It may be used for other non-eGauge applications as it utilizes a well known FT230X chipset from FTDI. However, eGauge Systems does not provide support for these applications.
EG4xxx and newer
- This hardware is compatible with EG4xxx models and newer.
Prerequisites
- Ensure proper wiring between serial devices. Only connect data signals, and signal ground (not earth ground).
- Multiple serial devices on the same chain should be configured with unique Modbus IDs and consistent serial settings.
- After connection, software configuration is required. A valid login to the eGauge meter interface is needed to make changes to device settings.
Instructions
Before beginning, check that you have all of the included parts:
| Qty | Item |
| 1 | eGauge USB485 converter |
| 1 | 3' Mini USB to USB-A cable |
| 1 | 3-pin input plug |
Step 1: Wire the USB485, and signal ground connections using the included 3-pin plug. Use twisted pair wire for D+ and D- connections.
| USB485 port | Connect |
| D+ | positive serial |
| D- | negative serial |
| ⏚ | Signal Ground |
| Mini-USB | connect included USB cable |
Step 2: Turn the termination DIP switch to ON if it is the last connection on the serial line. Termination should be OFF if it is daisy chained in-between devices.
Step 3: Connect the included USB cable to the EG4xxx USB1 or USB2 port. Take note of which port is used:
Step 4: Configure the eGauge settings for the installation type:
- If exporting eGauge data via Modbus RTU to another system, see the Modbus output communication article.
- If importing data from a remote Modbus RTU device to the eGauge, see the Modbus input article.
- Information regarding configuring BACnet settings with an MS/TP connection please refer to: How To: Configure the BACnet service
Additional Resources
Related Articles
Example Wiring Diagram
Multiple serial device can be daisy chained on the same line as shown in the diagram below, if needed:
