dS1242
dS1242 User Manual v4.10
Serial Port Connections
TTL serial ports.
The dS1242 has one serial port header.
Pin 1 is marked on the PCB.
Tx and Rx operates at 3.3v levels, however
the Rx input is 5v tolerant. Most 5v TTL level
serial ports will accept a full 3.3v input ensur-
ing the port is compatible with most 5v de-
vices such as the LCD05 display modules.
That is the reason 5v (rather than 3.3v) is
available on pin1 to power external modules.
The 5v supply can source up to 200mA. Keep
the leads short and away from high voltages.
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