Edimax Technology PT-31W user manual Protocol

Here are the descriptions of every setup item:

Item	Description
Enable RS-485	Check this box to enable RS-485 functionality.
Use Pelco-D	Select this option and RS-485 interface will output pan-tile control signal
	in Pelco-D format. This format is widely accepted by most of pan-tilt
	camera cradles.
	You have also input pan-tilt camera cradle’s address code in ‘Address’
	field (number must be between 0~255). This code must be identical to
	pan-tilt camera cradle’s address code.
Use Custom	When the pan-tilt camera cradle does not support Pelco-D protocol, you
Protocol	can define a protocol’s detail by this function.
	Please refer to pan-tilt camera cradle’s user manual to define the
	protocol.
	- Baud Rate: Select data baud rate of RS-485 interface that pan-tilt
	camera cradle will accept. When the length of RS-485 connection is
	very long (longer than 200M), it’s not recommended to use high
	speed connection (greater than 2400bps).
	- Data Bits: Select data bits of RS-485 connection.
	- Parity: Select parity bit: odd, even, or space.
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