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Diamond Point International

Contec COM-1P(USB)H - One Port USB to Isolated Serial Product

External USB Product - One Isolated RS-232 Compatible Serial Port with Standard DB9 Connector


Contec's COM-1P(USB)H is an isolated USB 2.0 converter for performing RS-232C serial communications with external devices. Each converter has one channel RS-232C serial port. You can use the standard COM driver software (COM Setup Disk) supplied with the converter to access the serial ports as standard Windows COM ports. This product is higher noise-resistant models with isolation between a PC and bus line as well as a surge protection circuit for communication ports.


  • Conforming to the USB 2.0 and USB 1.1 standards
  • Uses the same easy-to-use D-SUB 9 pin connectors as a PC. The converter has a D-SUB 9 pin connector (female), allowing you to directly connect it to a device such as a modem. You can also connect it to a cable having a D-SUB 9 pin connector (female) through the bundled gender changer. (* The gender changer is attached before shipment.)
  • Maximum communication speed = 921,600bps. This converter is equipped with separate 128-byte and 384-byte buffers for transmit and receive. 
  • Driver software is supplied to allow the serial ports to be used as standard Windows COM ports.(They can be set to arbitrary COM port numbers.) A maximum of 127 terminals can be installed as configured in the range COM1 to COM256.
  • The communication lines for each channel are electrically isolated from each other and from the PC. Surge protection is provided for each RS-232C signal line. 



Interface1 RS-232 serial port
Data: 7, 8 bit / 1, 2 stop bit
Controller: FTDI FT232BL
Data Rates300 - 921,600bps
OtherIsolated specification: Bus isolation
Dielectric strength: 300VDC
Connector(s)USB side : USB A connector
RS-232C side : 9 pin D-SUB connector (female)


ExpansionUSB Specification 1.1/2.0 standard
Electrical5VDC 280mA (Max), bus powered
Mechanical78.3(W) x 20.5(D) x 36.5(H) mm
91.0(W) x 20.5(D) x 36.5(H) mm (When connecting gender changer)
Cable length: 1.8m
SoftwareWindows (all versions from XP onwards), Linux
TemperatureTemperature range (operation): 0 to +50°C
Humidity10 - 90%RH(No condensation)
140g (When connecting gender changer)
Warranty1 Year

Ordering Details

COM-1P(USB)H Isolated RS-232C 1ch Micro Converter for USB2.0
AccessoriesCN5-D9F 9pin D-SUB (Female) Connector Five-piece Set
CN5-D9M 9pin D-SUB (Male) Connector Five-piece Set
RSC-25F/9F Cross Cable for Connector Conversion, RS-232C(25F -> 9F, 1.8m)
RSC-9F Cross Cable, RS-232C D-SUB9P(1.8m)
RSS-25M/9F Straight cable for Connector Conversion, RS-232C(25M -> 9F, 1.8m)
SS-9M/F Straight Cable, RS-232C D-SUB9P(1.8m)