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C2904M-B (2/05) 25
CONNECTING DATA TERMINALS
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).
USE AS CONTROL TERMINAL PORT
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
Pin Name Direction Description
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– – –
USE AS TRANSPARENT DATA PORT
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
Pin Name Direction Description
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