DESCRIPTION: The TTL to RS232 Serial Adapter is used to connect TTL (Transitor-Transitor Logic) level signals to an RS-232 interface. The TTL side is a 9-pin female connector, and the RS-232 side is a 9-pin male connector. The TTL side has a voltage suppression network designed to protect against ESD (ElectroStatic Discharge) and EFT (Electrical Fast Transient).
The unit can be powered through one of the connector pins or through the side mounted power jack (see Power Supply options). Power by a connector pin is accomplished by supplying 5-9VDC on pin 5 of the TTL connector. The power is passed through to pin 4 of the RS232 connector which can be disabled by removing R2. Power by the side mounted power jack is accomplished with a 5-9VDC power supply.
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