Справочник Пользователя для Pelco PelcoNet Multimedia Transmission Via Networks C2904M-B

C2904M-B (2/05)

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The bi-directional data interface ports can be used as control ports for equipment connected to the NET4001A (for example, a dome
camera with motorized lens).

For local control and configuration of the unit, you can connect the COM port of a data terminal (for example, a PC running a standard
terminal program) to COM 1 on the NET4001A.

You can use a standard terminal program to communicate with the unit. The default parameters are set to 19200 baud, 8 bits of data, 1
stop bit, and no parity (8N1).

For more information on the command set, see the 

Configuration section. This mode allows the control port to be used to send serial data

that requires flow control.

You can configure the RS-232 half-duplex mode in the web browser. The RTS and CTS signals are enabled for flow control.

If this RS-232 mode is chosen, the camera control data is transferred to this port. Certain cameras with fixed data length require the
buffered RS-232 mode. (This half-duplex mode is not required for interfacing to any Pelco product.)

Figure 19.  Control Terminal Port Pin Assignments in RS-232 Mode

1   2   3   4   5

6   7   8   9

VIEWED FROM SOLDERING

SIDE OF PLUG

1

DCD

Input

Data Carrier Detect

2

RXD

Input

Receive Data

3

TXD

Output

Transmit Data

4

DTR

Output

Data Terminal Ready

5

GND

Ground

6

DSR

Input

Data Set Ready

7

RTS

Output

Ready To Send

8

CTS

Input

Clear To Send

9

–

–

–

The COM 2 serial interface offers a transparent serial data channel between the receiver and the transmitter. A typical application for
transparent data is remote control of peripheral equipment (for example, a dome system with PTZ functions). You also can use these
channels to control remotely any external device with a serial interface. The serial data is transferred in parallel to the video and audio
data.

Transmission of transparent data is enabled only after a video connection has been established. Also, the RS-232 interface for the
transparent data port does not support hardware flow control.

For proper operation, you must configure the following: baud rate, parity of the interface of the PelcoNet NET4001A transmission system
unit, and number of data and stop bits. Use a web browser to configure these parameters at the unit.

The transparent data interface is used to control PTZ cameras remotely, to transmit data transparently between the two units, or to
control equipment connected to a PC COM port. Transmission of transparent data is possible only when the units are connected. Only the
data transmit and receive signals are provided at this port.

1   2   3   4   5

6   7   8   9

VIEWED FROM SOLDERING

SIDE OF PLUG

1

–

N.C.

2

RXD

Input

Receive Data

3

TXD

Output

Transmit Data

4

–

N.C.

5

GND

Ground

6

–

N.C.

7

–

N.C.

8

–

N.C.

9

–

N.C.

Figure 20.  Data Port Pin Assignments in RS-232 Mode