Hi..I am currently doing a LED dot matrix display project. My aim is to display characters from a textfile to the external dot matrix display. I'm going to use RS 232 to interface with my circuit. So i have a few doubts. Hope you can help me answer my doubts. Thank You!
Can anyone tell me where to get more details about RS 232 serial port??
(Eg. how to interface with it?,which one is better?25pins or 9pins?, data sheet)
Is RS 232 buffer used as a voltage converter to convert voltage output from computer to a higher serial voltage level? Or it is used to convert voltage level from external devices to TTL voltage level?It can be used for both operation?
Is it a must a RS 232 serial port must used with RS 232 buffer?
Hi..I am currently doing a LED dot matrix display project. My aim is to display characters from a textfile to the external dot matrix display. I'm going to use RS 232 to interface with my circuit. So i have a few doubts. Hope you can help me answer my doubts. Thank You!
Can anyone tell me where to get more details about RS 232 serial port??
(Eg. how to interface with it?,which one is better?25pins or 9pins?, data sheet)
It makes no difference, the only difference is the size of the plug - basically older equipment used 25 pin plugs, and later ones use 9 pin.
Is RS 232 buffer used as a voltage converter to convert voltage output from computer to a higher serial voltage level? Or it is used to convert voltage level from external devices to TTL voltage level?It can be used for both operation?
Yes to all, IC's are generally designed to work with a MAX232, so the inversion is accounted for - for example, the hardware UART's in PIC's connect directly to the MAX232 - they are designed to do so. This means you can't use the hardware UART unless you provide a hardware inverter, but you can still do it easily in software.