Ratoc Systems REX-5056V Serial Port Expansion D-SUB 9-pin

Easily add a serial port to your laptop
Expand Windows standard COM ports: Equipped with a 16550 compatible UART.
Easy Plug & Play installation of Windows standard serial interface drivers.
Programs developed for Windows standard COM ports can be used as is.
Connect devices with serial ports: Connect modems, barcode scanners, magnetic card readers, serial printers, terminal adapters (ISDN), electronic scales, and other industrial measurement equipment with RS-232C ports.
Maximum DTE communication speed 115.2Kbps. Application development in C language possible under MS-DOS: Includes Multiport Serial Communication Driver (MCD) and C language library as standard.
Supports building communication applications using RS-232C cards not only in DOS/V but also in NEC PC-98 environments.
Uses the industry-standard D-Sub 9-pin connector for serial ports.
Additionally, custom cables can be ordered for situations where power supply to devices in the field is required.
ACPI compatible: Operates in power-saving mode when not in use due to ACPI compatibility.
Also includes a serial communication card power management utility, allowing active state to be maintained even in power-saving mode. RoHS compliant, environmentally friendly.