Originally uploaded by kris_wotipka
Well, I ran out of room quickly on the PICAXE dev board. So this is an outboard TTL to RS232 board. You can see some header pins in various places. I have the option to be able to switch pins 2 & 3 via some headers to create a null modem or normal pinout scheme on the DB9. I also have to option to put the hex inverter inline via headers. I left room to put another DB9 to take advantage of the other two channels in the 232 chip and the other channels in the hex inverter.
This board is used to convert the TTL levels of the PICAXE to RS232 and invert the logic if necessary. The biggest lesson learned here was not to crowd the components on the board.