Quote:
Originally posted by Matt Leese
This is mostly an educated guess but I'm assuming TTL Serial port means that the line level outputs of the serial port are at TTL level. TTL level defines zero as from 0 to 0.8 V and a one as from 2 to 5 V. Now, normal RS232 Serial Ports have an operating range from -15V to 15V for their output. The TTL Serial Port is a serial port that is specifically designed to interface with either TTL or TTL-compatible circuits. This means that it's much more effective for controlling a custom circuit than a regular RS232 Serial Port.
Matt
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Just about dead-on. TTL is short for Transistor-to-Transistor Logic. The PIC Processor has a USART capable of 2 separate serial communications, in addition to the master serial port.
Quote:
Originally posted by Dave Flowerday
Also, those USB to serial converters aren't always that great. We tried using a few last year to program our custom circuit microcontroller and it was a no-go.
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I was one step ahead of you and checked into that. According to
this site, the one's I listed have few compatibility problems.