Mounting Options:
DIN-Rail Series
Workstation Series
Desktop Series
Rack Mount Series
Industrial Grade Rack Mount 8 Port USB RS-232, RS-422, RS485 Octal Serial Adapter with Metal Case and Built-In 100-240Volt Power Supply utilizing a FTDI chipset.
The USB-8COMi-RM 8 Port USB to RS-232/422/485 Serial Adapter is designed to make serial port expansion for industrial applications convienent and fast. Whether it’s connecting to a computer’s host USB port or USB hub, the 8 Port USB Serial Adapter instantly Adds eight RS-232, or RS-422, or RS-485 serial communication ports to your system using Plug-and-Play technology.
By connecting the 8 Port USB Serial Adapter to your computer, the adapter is automatically detected and installed with no IRQ & COM port conflicts or configuration since the ports do not require any additional IRQ, DMA, memory. The adapter is self-powered, and has built-in switching power supply of 100V/240V (input) inside the chassis.
The USB-8COMi-RM serial adapter is designed with 8 external 4-pin dip switches to independently set RS-232, RS-422or RS-485 mode conveniently, without the need to open the metal chassis. The adapter is with DIN rail bracket for industrial application environments and can be also mounted to a 19 rack, the rack mount kits are included with the adapter.
Termination and biasing option are available for data transmission lines. The USB-to-Octal RS-232/422/485 Adapter provides instant connectivity to RS-232, RS-422, RS-485 communication devices for POS, factory automation equipment, multi-drop data collection devices, bar code readers, time clocks, scales, data entry terminals, PC to PC long distance communications, ATMs and serial communication in harsh environments.
The USB-8COMi-RM USB to Industrial I/O provides industrial solution requiring single node or multi-drop communications over short and long distance.
Additional Features:
OS Support:
Package Contents
*Surface Mounting screws not included.
Compliance |
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Physical Characteristics |
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Serial Attributes |
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Software |
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Environmental |
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Product Information |
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Hardware |
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Performance & Safety |
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Other Data |
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USB Bus | |
Compliance | USB 1.0/1.1 compliant, USB 2.0 compatible |
Speed | 12 Mbps, full-speed USB |
FIFO | 128 byte transmit FIFO 384 receive FIFO |
Serial Interface | |
Port Type | RS-232/RS-422/RS-485 selectable |
Number of Ports | 8 |
Connectors | DB9 male |
Serial Line Protection | |
ESD Protection | 10KV |
Serial Port Speed | |
Baudrate | 300 bps to 921.6k bps |
Serial Communication Parameters | |
Data Bits | 5, 6, 7, 8 |
Stop Bits | 1, 1.5, 2 |
Parity | None, Even, Odd, Space, Mark |
Flow Control | RTS/CTS, XON/XOFF |
Serial Signals | |
RS-232 | TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND, RI |
RS-422 | TxD-(A), TxD+(B), RxD+(B), RxD-(A), GND, RTS-(A), RTS+(B), CTS+(B), CTS-(A) |
RS-485-4 wire | TxD-(A), TxD+(B), RxD+(B), RxD-(A), GND |
RS-485-2 wire | Data-(A), Data+(B), GND |
Driver Support | |
OS | Windows 7, Vista, 2003, XP (WHQL certified) and 2000 Linux Kernel 2.4 and up built-in support |
Power Supply | |
Input | Self-powered Built-in AC to DC switching power supply with wide Range of AC input from 100VAC to 240VAC |
Mechanical | |
Chassis | SECC metal chassis with DIN rail bracket Rack-mounting brackets included |
Environmental | |
Operating Temperature | 0 to 55 °C (32 to 131 °F) |
Operating Humidity | 5 to 95% RH |
Storage Temperature | -20 to 75 °C (-4 to 167 °F) |
RS-232 & RS-422 & RS-485 DB9 Male Connector Pin-outs | ||||||||||||||||||||||||||||||||||||||||
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RS-232 DB9 Male | ||||||||||||||||||||||||||||||||||||||||
RS-232 Signal Pin-outs of DB-9 Male |
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RS-422 DB9 Male | ||||||||||||||||||||||||||||||||||||||||
RS-422 Signal Pin-outs of DB-9 Male |
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RS-485 DB9 Male | ||||||||||||||||||||||||||||||||||||||||
RS-485 4-Wire (Full duplex) Signal Pin-outs of DB-9 Male |
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RS-485 2-Wire (Half duplex) Signal Pin-outs of DB-9 Male |
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RS-422 Signal Wiring |
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Point-to-Point 4 Wire Full Duplex |
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USB-8COMi-RM RS-422 Device |
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RS-422 with Handshaking |
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USB-8COMi-RM RS-422 Device |
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RS-485 Signal Wiring | ||||||||||||||||||||||||||||||||||||||||
Point-to-Point 4-Wire Full Duplex |
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USB-8COMi-RM RS-485 Device ![]() |
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Multidrop RS-485 2-Wire Half-duplex |
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USB-8COMi-RM RS-485 Device ![]() |
The 8 Port USB to RS-232/422/485 Octal Adapter has certain accessories that work with it. These accessories are what you can order if needed.
View frequently asked product questions below. For all serial troubleshooting, visit this page.
Still need help? Reach out!
Test your components by:
When testing cables:
When testing serial ports and devices:
Note: You are required to restart your computer after disabling the Driver Signature Enforcement. Save all open work on your computer.
Disable driver signature enforcement:
When your system restarts:
When your computer restarts, Driver Signature Enforcement will be disabled and you can install the drivers.
Note: You are required to restart your computer after disabling the Driver Signature Enforcement. Save all open work on your computer.
Disable Driver Signature Enforcement:
After your computer restarts:
When your computer restarts, Driver Signature Enforcement will be disabled and you can install the drivers.
Once the driver/software is installed, follow these steps to allow the software: