The Quatech QSC(LP)-200/300 User Manual provides installation, configuration, and operation instructions for the four‑channel RS‑422/485 PCI communications…
This manual describes the Quatech QSC(LP)-200/300, a four‑channel RS‑422/485 asynchronous communications adapter for PCI‑bus PCs. It outlines the device features, hardware configuration options, jumper settings, and the automatic BIOS/OS configuration. Detailed sections cover signal connections, optional surge‑suppression upgrades, and high‑speed UART clock options.
Installation steps, resource mapping, technical specifications, and troubleshooting guidance are provided. The document also includes warranty information, compliance declarations, and contact details for technical support.
| Bus interface | PCI, 32-bit bus, Universal Signalling Voltage |
|---|---|
| Dimensions | approx. 4.725" x 2.5" |
| Serial ports controller | 16750 with 64-byte FIFOs |
| Interface | Custom cable to four female D‑9 connectors |
| Transceivers | MAX-3076E or compatible |
| Differential output (RS‑422) | 2 V min. with 50‑Ω load |
| Differential output (RS‑485) | 1.5 V min. with 27‑Ω load |
| Output rise/fall time | 15 ns max. |
| Differential input threshold | -0.2 V min., -0.05 V max. |
| Input resistance | 96 kΩ min. |
| Input current | -100 µA min., +125 µA |
| Power requirements | +5 V, approx. 250 mA |
| Operating temperature | 0 °C to 70 °C |
| Storage temperature | -50 °C to 80 °C |
| Humidity | 10 % to 90 % |
Quatech, Inc. warrants the QSC(LP)-200/300 to be free of defects for five (5) years from the date of purchase.
Install the jumper on pins 17 and 18 (Force High‑Speed UART Clock) to multiply the UART input clock frequency by eight.