Ch438 Chip Expandability : Expand Your Serial Communication Capabilities With Ease Using The Ch438 Chip, Capable Of Supporting Up To 24 Serial Ports For Enhanced Connectivity. Modem Signal Compatibility : Enjoy Seamless Compatibility With A Wide Range Of Devices Thanks To Comprehensive Support For Modem Signals Such As Cts, Dsr, Ri, Dcd, Dtr, And Rts. Rs232 Level Conversion : Our Card Features Rs232 Level Conversion, Ensuring Compatibility Across A Variety Of Devices And Applications. Flow Control And Error Detection : Benefit From Advanced Hardware Flow Control And Serial Port Frame Error Detection, Providing Increased Reliability In Data Transmission. Half Duplex Direction Control : The Card Offers Programmable Half Duplex Direction Control, Ensuring Optimal Turn-Around Delay For Seamless Communication. Elevate your communication solutions with our cutting-edge PCIe expansion card. Designed to meet the demands of advanced users, it offers expandability up to an impressive 24 serial ports through the CH438 chip, ensuring robust connectivity for various applications. With comprehensive support for modem signals and RS232 level conversion, compatibility across devices is guaranteed. Our card also features advanced hardware flow control and serial port frame error detection, making data transmission more reliable than ever. For seamless communication, the programmable half duplex direction control offers optimal turn-around delay, enhancing the overall user experience.