As of June 15, 2022, this site no longer supports Internet Explorer. Please use another browser for the best experience on our site.

TCC-80/80I Series

Port-powered RS-232 to RS-422/485 converters with optional 2.5 kV isolation

moxa-tcc-80-80i-series-image-1-(1).jpg | Moxa
moxa-tcc-80-80i-series-image-2-(1).jpg | Moxa
moxa-tcc-80-80i-series-image-3-(1).jpg | Moxa
moxa-tcc-80-80i-series-image-4-(1).jpg | Moxa
moxa-tcc-80-80i-series-image-5-(1).jpg | Moxa

Features and Benefits

  • External power source supported but not required
  • Compact size
  • Converts RS-422, and both 2-wire and 4-wire RS-485
  • RS-485 automatic data direction control
  • Automatic baudrate detection
  • Built-in 120-ohm termination resistors
  • 2.5 kV isolation (for TCC-80I only)
  • LED port power indicator


  • moxa-ul-listed-certification-logo-image.png | Moxa
  • moxa-ce-certification-logo-image.png | Moxa
  • moxa-fcc-certification-logo-image.png | Moxa
Contact Sales


The TCC-80/80I media converters provide complete signal conversion between RS-232 and RS-422/485, without requiring an external power source. The converters support both half-duplex 2-wire RS-485 and full-duplex 4-wire RS-422/485, either of which can be converted between RS-232’s TxD and RxD lines.

Automatic data direction control is provided for RS-485. In this case, the RS-485 driver is enabled automatically when the circuitry senses the TxD output from the RS-232 signal. This means that no programming effort is required to control the transmission direction of the RS-485 signal.

Port Power over RS-232

The RS-232 port of the TCC-80/80I is a DB9 female socket that can connect directly to the host PC, with power drawn from the TxD line. Regardless of whether the signal is high or low, the TCC-80/80I can obtain enough power from the data line. However, external power can be used if the handshake line is not available, if the serial cable is too long, or if the RS-232 device is a low-power device. For external power, a five to twelve VDC power supply can be connected using an adapter or a USB power cord.

Port Power Dissipation

When installing a TCC-80 or TCC-80I converter, it is important to pay attention to power consumption, RS-232 cable length, and RS-422/485 transmission distance. In general, the TCC-80 and TCC-80I obtain 50 mW of power from the power source. Standard PC COM ports can provide 70 to 90 mW of power if the TxD, RTS, and DTR lines are connected. Moreover, the RS-232 cable should be shorter than 15 m (@ 9600 bps) to ensure that less power is lost from the host/device to the TCC-80. The remainder of the supplied power is used for transmitting the RS-422/485 signal.

Port Power and Optical Isolation

The RS-232 port of the TCC-80/80I is a DB9 female socket that can connect directly to the host PC, with power drawn from the TxD line. Electrical 2.5 kV isolation for the TCC-80I is achieved with a photo coupler that transforms the electrical signal into light, and then re-transforms the light back into an electrical signal on the other side. In this way, the two electrical circuits are completely isolated from each other. This also protects the devices from ground loop currents, reduces damage caused by data loss, and prevents damage to the communication interfaces.

LED Port Power Indicator

It’s easy enough to test the serial device with a multimeter to determine that the serial device will provide enough power to the media converter. However, it’s even easier to let the TCC-80I test the device for you. Simply connect the TCC-80I to the device’s RS-232 port and set the SW4 switch to Test mode. If the port power LED indicator lights up, the TCC-80I is receiving enough power. If the LED does not light up, you will need to attach an external power source to the TCC-80I.

  • Connector

    TCC-80-DB9/80I-DB9: DB9 male
    TCC-80/80I: Terminal block

  • No. of Ports


  • Serial Standards


  • Isolation

    TCC-80I/80I-DB9: 2 kV

  • RS-485 Data Direction Control

    ADDC (automatic data direction control)

  • Terminator for RS-485

    N/A, 120 ohms, 120 kilo-ohms

  • Baudrate

    300 bps to 115.2 kbps

  • RS-422

    Tx+, Tx-, Rx+, Rx-, GND

  • RS-485-4w

    Tx+, Tx-, Rx+, Rx-, GND

  • RS-485-2w

    Data+, Data-, GND

  • RS-232

    TxD, RxD, GND The DTR, DSR, DCD, CTS, and RTS pins are internally shorted.

  • Input Current

    TCC-80: 30 mA @ 5 to 12 VDC
    TCC-80-DB9: 30 mA @ 5 to 12 VDC
    TCC-80I: 20 mA @ 5 to 12 VDC
    TCC-80I-DB9: 20 mA @ 5 to 12 VDC

  • Input Voltage

    5 to 12 VDC

  • No. of Power Inputs


  • Overload Current Protection


  • Source of Input Power

    Power input jack

  • Housing

    Plastic top cover, metal bottom plate

  • IP Rating


  • Dimensions

    TCC-80/80I: 42 x 80 x 22 mm (1.65 x 3.15 x 0.87 in)
    TCC-80-DB9/80I-DB9: 42 x 91 x 23.6 mm (1.65 x 3.58 x 0.93 in)

  • Weight

    50 g (0.11 lb)

  • Installation


  • Operating Temperature

    0 to 60°C (32 to 140°F)

  • Storage Temperature (package included)

    -20 to 75°C (-4 to 167°F)

  • Ambient Relative Humidity

    5 to 95% (non-condensing)

  • EMC

    EN 55032/35

  • EMI

    CISPR 32, FCC Part 15B Class A

  • EMS

    IEC 61000-4-2 ESD: Contact: 4 kV; Air: 8 kV
    IEC 61000-4-3 RS: 80 MHz to 1 GHz: 3 V/m
    IEC 61000-4-4 EFT: Power: 1 kV; Signal: 0.5 kV
    IEC 61000-4-5 Surge: Power: 1 kV
    IEC 61000-4-6 CS: 150 kHz to 80 MHz: 3 V/m; Signal: 3 V/m
    IEC 61000-4-8 PFMF

  • Environmental Testing

    IEC 60068-2-1
    IEC 60068-2-2
    IEC 60068-2-3

  • Safety

    UL 60950-1

  • Vibration

    IEC 60068-2-6

  • Time

    2,781,161 hrs

  • Standards

    Telcordia (Bellcore), GB

Support Documents

Name Type Version Release Date
Datasheet for TCC-80/80I Series
1.3 MB
Datasheet v1.5 Dec 19, 2022 Dec 19, 2022
QIG for TCC-80/80I Series
460.1 KB
QIG v4.1 May 06, 2021 May 06, 2021
2D CAD for TCC-80 TOP
382.0 KB
2D CAD Jul 07, 2015 Jul 07, 2015
2D CAD for TCC-80-DB9
352.6 KB
2D CAD Jul 07, 2015 Jul 07, 2015

Available Models (4)

Show Images
moxa-tcc-80i-db9-image.jpg | MoxaTCC-80I-DB9moxa-tcc-80-image.jpg | MoxaTCC-80moxa-tcc-80i-image.jpg | MoxaTCC-80Imoxa-tcc-80-db9-image.jpg | MoxaTCC-80-DB9
Serial ConnectorDB9Terminal BlockTerminal BlockDB9
Add to QuoteView BagAdd to QuoteView BagAdd to QuoteView BagAdd to QuoteView Bag

Extend the Reach of Your Field Devices

Our wide range of media converters connect field devices to a variety of communication systems


product image

Buy online from distributors

Added To Bag
You have some items waiting in your bag; click here to finish your quote!