Whats the difference between TTL and RS-232 readers?
Operationally, there is not much difference. Both types are compatible with MCAS. In fact, your application will not know the difference. TTL (clock/data) readers are generally less expensive since they provide no onboard processing for assembling card data. On card-swipe, there is no data latency as they deliver the data immediately to the controller (i.e., MCAS) to assemble and decipher in realtime. RS-232 readers provide a standard, more popular interface. On card-swipe, they assemble and decipher the data, relieving the controller of this duty. The deiphered data is then delivered to the controller. (RS-232 readers introduce a minimal amount of data latency.) Both readers work well and are suitable for use with MCAS.
