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I-O 4020 - Twinax & Coax Interfaces
for Lexmark 2380/81, 2390/91, 2480/81 & 2490/91

I-O 8220 Test TextTwinax Printer Interface for Lexmark 2300 & 2400 Series Matrix Printers

PLEASE NOTEThe 4020 Printer Interface has been discontinued.   It is available as a refurbished product only.  The direct replacement product is the Praim PR165 Twinax Printer Interface.  Please click here to be taken to the Praim PR165e Interface page.


The I-O 4020 Printer Interface models easily attach Lexmark 23XX Plus dot-matrix printers to IBM host systems and are quickly configured through on-board DIP switches and Host/PC download commands. The printer interfaces offer the following features:

  • The I-O 4020TX model provides direct
    Twinax attachment to IBM AS/400, S/3X
    hosts or 5x94 remote controllers.

  • The I-O 4020CX model provides coax connectivity
    to IBM 3270-type mainframe 3174, 3274, or 3276 control units.

  • These direct-attach Twinax and coax interfaces include the industry’s best IBM 4214, 5224/25/56, and 3287/68/62 printer emulations.

  • The additional full-sized Centronics parallel port allows for economical and intelligent printer sharing between the IBM host and a PC or even LAN.

  • The I-O Command Pass-Thru™ feature allows complete access to
    all user programmable printer options, such as printer resident bar code capabilities.

  • The interface’s seamless integration allows for complete access to all additional paper handling options, like the Tractor 2 feeder.

  • APF/BGU printing is supported across all IBM printer emulations.

Click here for more information on Twinax and Coax Interfaces

IBM Features

Twinax AS/400

  • Attaches to IBM AS/400 or System/3X Hosts, or 5X94 Controllers

  • Supports IBM 4214, 5224, 5225, 5256 Printer Emulations

  • Supports 16 Languages

  • Supports OfficeVision/400, DisplayWrite/36

Coax 3270

  • Attaches to IBM 30XX, 43XX, and 937X Hosts or 3X74, and 3276 Controllers and compatibles

  • IBM 4224, 4214, and 3287/68/62 Printer Emulations (all non-IPDS)

  • Supports LU3 (DSC) and LU1 (SCS) Mode Printing

  • Supports All Applicable IBM RPQs

Additional Features



Low Capital Investment

Add a host printer while leaving money in the budget for other purchases.

Configuration Through On-Board DIP Switches and Host/PC Download Commands

Conveniently customize the I-O 4020 to be up and running in minutes.

True IBM Printer Emulations

Replace IBM system printers without re-writing existing applications.

Parallel Sharing Port Included

Increase the availability of the printer by sharing it between the IBM host and a PC or even LAN without paying extra.

I-O Command Pass-Thru™

Access all programmable functions of the attached printer such as bar codes, fonts, etc.

Compact Design

Utilize all of the printer’s paper handling options, such as the tractor 2 feeder.

Specifications of I-O 4020TX (Twinax) & 4020CX (coax)


Feature / Description

Host Systems

Twinax (5250) or Coax (3270)


IBM Twinax (4020TX) or coax (4020CX) to Centronics parallel


Supplied by the printer


Temperature: +40░ to 110░ F (+5 to 42░ C)
Relative humidity: 20% to 85%
Optimum: 70░ +/- 15░ F (24░ +/- 8░ C)


FCC A; CE EN 55022


4" x 5.25" x 1" (10 x 13 x 2.5 cm)

Ordering Information

Item Number

Product Description


Twinax Interface for Lexmark 23XX/24XX Printers


Coax Interface for Lexmark 23XX/24XX Printers

Click here for more information on Twinax and Coax Interfaces



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