PCI CH351Q 1P DB25 LTP1 Printer Expand Card

It can be configured as a dual-channel serial port or a single parallel port/printing port of the PCI bus.

  • PO.: ST319
  • P/N.: SP-PL351A-1P
  • Bus Type: PCI
  • Media Port: DB-25 Connectors
  • Main Chipset: CH351Q


PCI Bus dual Serial port or Printer port Controller


CH351 is a dual serial port or printer port chip for PCI bus. It contains two 16C550-compatible asynchronous serial ports or an EPP/ECP enhanced bidirectional parallel port. The asynchronous serial port supports half-duplex transmission and reception automatic switching, and supports a communication baud rate of up to 4Mbps. RS232 serial port expansion for PCI bus, PCI high-speed serial port with automatic hardware rate control, serial port networking, RS485 communication, parallel port/print port expansion PCI plug-in card, etc.



- Fully compliant with PCI Local Bus Specification, Revision 2.2

- Fully customizable PCI Configuration Space

- PCI signaling Supports PCI Power Management

• Serial Port

- Two completely independent asynchronous serial ports, compatible with 16C450, 16C550 and 16C552 and enhanced.

- Support 5, 6, 7 or 8 data bits and 1 or 2 stop bits.

- Supports odd, even, no parity, blank 0, mark 1 and other verification methods.

- Programmable communication baud rate, supporting 115200bps and up to 4Mbps communication baud rate.

- Built-in 16-byte FIFO first-in-first-out buffer, supporting 4 FIFO trigger levels.

- Support MODEM modem signals CTS, DSR, RI, DCD, DTR, RTS, which can be converted to RS232 level by 75232 chip.

- Support hardware flow control signals CTS and RTS automatic handshake and automatic transmission rate control,

compatible with TL16C550C.

- Support serial frame error detection and Break line interval detection.

- Supports full-duplex and half-duplex serial communication, provides DTR/TNOW serial port sending status signal,

  supports RS485 receiving and sending automatic switching.

• IEEE1284 Parallel Port

- Support SPP, Nibble, Byte, PS/2, EPP, ECP and other IEEE1284 parallel port/print port working modes.

- Support two-way data transmission, supporting a transmission speed of up to 2M bytes per second.

Operating Temperature : -40 to +85 ℃

General specification
Chipset-controllerWCH® CH351Q

Bus type

PCI Revision.2.2
Transmission media1 x DB-25 female Parallel connector
Data rateup to 2M bytes per
FunctionSPP, Nibble, Byte, PS/2, EPP, ECP and other IEEE1284 parallel port/print port working modes
Operating Systems Windows 98 / ME / NT4.0 /2000 / XP / Vista / 2007 / 2008 / Win 7 / Win 8 /Win 10

Linux2.6.27,2.6.31,2.6.32,3.x.x and later

Hardware & environment

Operating Temperature-40 to +85℃
Storage temperature-55 to +125℃
Packing Accessories list

1 x PCI 1P DB25 LTP1 Parallel Printer card

1 x CD driver

1 x Low-profile bracket

Note: Only the above package contents, other products are not included.The allowable error of size measurement is +/- 1~3mm, and the weight of the product is subject to the actual product.

DimensionsL x W mm (measured without PCI bracket)
Package SizeL175 x W125 x H30 (Built-in Blister)
Product weight g
Package weight



PO#P/NSpecificationsOrdering Note
    ST319    SP-SL351A-1PPCI 1P DB25 LTP1 Parallel Printer card

Based on WCH CH351Q Controller
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