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The RS422 to TTL (UART) module utilizes the MAX490 chip by maxim integrated. The Max490 is a low-power transceiver for RS-485 and RS422 communication, and it contains one driver and one receiver. The MAX490 features reduced slew-rate drivers that minimize EMI and reduce reflections caused by improperly terminated cables. In addition, the driver slew rates of the MAX490 are not limited, thus allowing error-free data transmission up to 2.5Mbps.
Simplified Block Diagram
- MAX 490 Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers - Data Sheet (PDF)...
- FAQs about Interface, RS-232, and RS-485 Circuits...
- How do I Connect Two RS422 Devices? (PDF)...
PC COM ports, USB virtual COM ports and ports in embedded systems are all addressed in this updated guide to programming, interfacing, and using serial ports.
Topics include using .NET’s SerialPort class for COM-port communications on PCs; upgrading existing RS-232 designs to USB or wireless networks, and creating serial networks of embedded systems and PCs.
Example circuits and code provide a quick start to projects. Installation and maintenance staff will also find tips for ensuring reliable operation and problem tracking.
Jan Axelson writes about computer programming and electronic technology. Jan's books include USB Embedded Hosts, USB Complete, Serial Port Complete, and USB Mass Storage. Jan's articles have appeared in Circuit Cellar, EDN, Embedded Systems Programming, and Nuts & Volts.