Pelco C1977M-D manual Second com port Terminal, RS485

The default parameters of the transparent data port agree with the most commonly used settings, as shown in the following table.

		Table F. Interface Settings
Configuration	Default	Description
Item	Settings
Transparent Data Port
Baudrate	9600	Select any transmission rate from 300 to 19200 baud.
Data bits	8	Select 7 or 8 data bits.
Parity	none	Select odd, even, or none.
Stop bits	1	Select 1 or 2 stop bits.
Control Terminal Port
Second com port	Terminal	The second COM port (Control Terminal port) can be set
		to use Terminal mode, which is used to program the unit
		through HyperTerminal.
		Or, it can be set to “COM 2,” which will allow control of
		devices such as a digital video recorder (DVR) or pan/tilt/
		zoom camera, etc. As such, it functions just like the
		Transparent Data port, thus providing two control ports.
		However, when set to “COM 2” PelcoNet can no longer
		be accessed through HyperTerminal.
Baudrate	19200	Select any transmission rate from 300 to 19200 baud.
Data bits	8	Select 7 or 8 data bits.
Parity	none	Select odd, even, or none.
Stop bits	1	Select 1 or 2 stop bits.
RS485
Halfduplex mode	off	If this RS-485 mode is chosen, the camera control data is
		transferred automatically to the control terminal port, which
		is a serial interface on the rear panel of the unit to which a
		PC can be hooked. This mode supports flow control.

NOTE: In the “on” or “buffered” mode, transparent data is rerouted to the control terminal port; terminal functions are provided on the transparent data port.

Pelco Manual C1977M-D (6/02) [ 47 ]