I-7561 DIN-Rail Mountable Serial RS-232/422/485 to USB Converter
Serial RS-232/422/485 to USB Converter
Supported Applications
The Omega I-7561 Series is a DIN-rail mountable serial converter designed to transfer data between USB interfaces and RS-232, RS-422, or RS-485 protocols. It enables the connection of legacy serial devices to systems utilizing a USB interface.
The series supports high-speed transmission up to 115.2 kbps and includes an internal Self-Tuner ASIC for auto-tuning baud rate and data format on RS-485 networks. The device is configured for industrial environments requiring isolated communication links, offering 3000 VDC isolation protection on the serial side.
Operating Conditions & Performance
The I-7561 Series operates within an ambient temperature range of -25 °C ~ +75 °C and a storage temperature range of -30 °C ~ +75 °C. Humidity ratings are specified as 10 ~ 90% RH, non-condensing.
Performance specifications include:
• Baud Rate Support: 300 ~ 115200 bps
• RS-485 Transfer Distance: Max. 1,200 m at 9.6 kbps; Max. 400 m at 115.2 kbps
• Maximum Supported RS-485 Devices: 256 (Without repeater)
• Power Consumption: 0.5 W, supplied via +5 VDC from USB
The unit features ESD protection for the RS-232/422/485 data line and utilizes fire retardant materials meeting UL94-V0 Level standards.
Configuration Options
The series is available in specific model configurations with distinct housing colors. The I-7561 CR provides the standard converter, while the I-7561-G CR offers a gray cover option; both are RoHS compliant and include one CA-USB18 (1.8 m) cable.
Key configurable or fixed capabilities documented for the series include:
• Housing & Mounting: Plastic casing with DIN-Rail installation
• Dimensions: 72 mm x 115 mm x 35 mm (W x H x D)
• USB Interface: USB Type B connector, compatible with USB 1.1 and 2.0 standards
• Serial Connection: Removable 10-Pin Terminal Block supporting RS-232 (Tx/D, Rx/D, GND), RS-422 (TxD+, TxD-, RxD+, RxD-), or RS-485 (Data+, Data-)
• Cabling: Supports 2-wire cabling using Belden 8941 (2P twisted-pair) and 4-wire cabling using Belden 8942 (4P twisted-pair); transmission distance may vary with different cables
• Status Indicators: Power LED included
The series supports various operating systems independent of the RS-232/422/485 port configuration. Note that RS-232, RS-422, and RS-485 cannot be used simultaneously.
Key Product Differences
The primary variation within the I-7561 Series is defined by the housing color option:
• I-7561 CR: USB to RS-232/422/485 Converter (RoHS)
• I-7561-G CR: USB to RS-232/422/485 Converter with Gray Cover (RoHS)
Both models share identical electrical specifications, isolation ratings, and mechanical dimensions. Optional accessories include the USB-2560 CR Industrial 4-port USB 2.0 Hub.
| Baud Rate | 300 to 115200 |
| Baud Rate Note | Max. 1,200 m for at speed 9.6 kbps; Max. 400 m at 115.2 kbps |
| Cable Length | 6 ft |
| Cable Note | Belden 8941 (2P twisted-pair cable)/Belden 8942 (4P twisted-pair cable), if different cables are used, the transmission distance may change. |
| Cable Type | 2P Twisted-Pair Cable, 4P Twisted-Pair Cable |
| Data Interface Note | RS232: TxD, RxD, GND, TxD+, RS422: TxD-, RxD+, RxD-, RS485: Data+, Data- |
| Height | 4.8 in |
| Input Cable Connector Type | RS232 / RS422 / RS485: 10 - Pins Terminal Block, Removable |
| Input Type | USB |
| Isolation | Three Way Protection: 3000 Vdc |
| LED Indicators | Power LED |
| Length | 1.5 in |
| Materials | ABS |
| Mounting | DIN-Rail Mounting |
| Number of Channels | 1 |
| Operating Temperature, Max | 75 °C |
| Operating Temperature, Min | -25 °C |
| Output Cable Connector Type | USB: Type B |
| Power Consumption | 0.8 W |
| Relative Humidity | 10 to 90% RH, Non-Condensing |
| Self Tuner | Yes, Asic Inside |
| Series ID | I-7561-Series |
| Storage Temperature, Max | 75 °C |
| Storage Temperature, Min | -30 °C |
| Supply Power Type | DC |
| Supply Voltage | 5 Vdc |
| Supported Devices | 256 (Without repeater) |
| Transmission Distance | 4000 ft |
| Width | 2.83 in |