document updated 19 years ago, on Nov 4, 2007
- tx/rx with PIC
- available modules
- TW523 ($25) — Two-way
- PL513 ($16) — One-way (transmit only)
- CM11A ($50) — Two-way RS232 with battery-backed timer
- Powerflash ($25) — One-way make/break
- background:
- PL513 notes