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TS-ISO485 - Dual UART with RS-485/RS-422 Shown with options - See larger images
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Dual UART with RS-485/RS-422

Starting at $90 (Qty. 100)


  • 2 PC compatible 16550 UARTS
  • Opto-isolated RS-485/RS422 drivers
  • Full and half duplex operation
  • Automatic RS-485 mode
  • Jumper selectable address & IRQ

TS-ISO485 is a PC/104 (standard format) peripheral board that provides two PC compatible COM ports capable of running up to 115K baud. The TS-ISO485 is compatible with any Technologic Systems' SBC that has a PC/104 connector built-in.


The TS-ISO485 includes galvanic isolation and transient noise suppression. Each UART is a 16550 with a 16 byte FIFO. Each COM port has opto-isolated RS-485/RS-422 drivers capable of running in full or half duplex mode (full-duplex RS-485 is the same as RS-422). On-board logic automatically controls transmit enable for half duplex operation. The I/O decode, IRQ settings and RS-485/RS422 mode are jumper configurable. More than one TS-ISO485 may be installed in a single system. Other TS-ISO485 features include:

  • Two RS-485/RS-422 capable serial ports
  • Automatic RS-485 mode
  • Full or Half Duplex modes supported (Jumper Configurable)
  • Standard 16C550 UART with 16 byte FIFO
  • Jumper selectable COM port (8 distinct IO locations)
  • Jumper selectable IRQ (IRQ 4,5,6,7,9 are available)
  • Supports IRQ line sharing
  • Compatible with TS ARM and x86 SBCs
  • Transient suppression circuitry for noise immunity
  • Galvanically isolated serial ports
  • Hardware detection of receive character gap of 3 character times
  • On board LEDs show TX and RX activity for each COM port

The TS-ISO485 features automatic RS-485 mode. In many implementations of RS-485, the user software must control which mode the transceiver is in (TX enabled or RX enabled). Since the UART has a FIFO and TX shift register, it is very difficult for software to know when it is time to switch from TX enabled, to the RX enabled mode. The TS-ISO485 has logic on board that switches it automatically at exactly the correct time, which is when the last bit of the TX character has been shifted out of the UART shift register.

Please, refer to the manual for further information.


The standard serial 16C550 COM port interface appears as a selectable PC-compatible COM port for software compatibility and no special drivers are required. For example, the TS-Linux distribution already includes Linux drivers for the 16C550 UART chip by default. One can use any terminal emulator, as minicom, to open and configure the serial port in use by this board with the appropriate /dev entry, enabling communication to the modem device plugged on the socket.

Please, refer to the manual for further information.

Detailed Feature List

  • 2 PC compatible 16550 UARTS
  • Opto-isolated RS-485/RS422 drivers
  • Full and half duplex operation
  • Automatic RS-485 mode
  • Jumper selectable address & IRQ
  • Isolation Voltage = 1500V
  • Transient and Surge suppression
  • Transmit/Receive indicator LEDs
  • Quick release screw terminals
  • PC/104 Dimensions 3.6 x 3.8 inches

Technologic Systems provides complete documentation for our mature products, including manuals, schematics, mechanical drawings, etc. The most recent documentation files are always made available through our website. If you don't find the documentation you are looking for, contact support for more information. Also, please make sure to visit our Embedded Systems Support webpage, our official WIKI and join our official Developers Forum.



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The prices below are available for sales orders requesting different quantities on a per release basis.

Product Configuration 1
10 25 50 100 250+
TS-ISO485 $95 $95 $90 $90 $90 Call us

Product Customization

Technologic Systems can provide you with a custom tailored version of our standard product starting at minimum order sizes of 100 units or more. Customized products can be based on various combinations of many of the standard product features. There will be a one-time customization fee to cover the set up of your custom part number and production processes. Once the set up is complete the standard lead time for your customized product would be 6-8 weeks. Please contact us to get started on tailoring this product to meet your needs. In addition to tailoring our standard product to your needs, for slightly larger orders sizes, Technologic Systems can also provide a custom design based on this product to meet your mechanical requirements or to add features.

What's Included

Use the table below to configure your product and add it to your cart. If you have any questions, please contact us for assistance.

Product Configuration
Part # Description Price Qty Total
TS-ISO485 Dual UART with RS-485 Peripheral $95 $95

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