The TTL to RS-232 adapter connects the Serial UART to the standard RS-232 port for testing and monitoring functionality. The Adapter facilitates ease of use and helps to reduce board space and cost.
Specifications:
Supports UART signals from 3 to 5 Volt
No additional power supply or power connection required (powered from RS-232 port)
Connects to the RS-232 interface via a female DB-9 connector and straight through extension cable
Only 3 TTL signals are required: ground, transmit and receive