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Pelco Manual C1977M-D (6/02) [ 25 ]
Transparent Data Port
The second serial interface, on the unit’s front panel, offers a transparent serial data channel between the
receiver and the transmitter. A typical application for the transparent data channel is remote control of
peripheral equipment (PTZ functions of selected cameras, for example). You can also use this channel
for remote control of 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 in a way that they fit the associated unit: baud
rate, parity of the interface of the PelcoNet Transmission System unit, and number of data and stop bits.
Use a web browser to configure these parameters at the unit with the configuration side.
The Transparent Data interface is used to remotely control PTZ cameras, transmit data transparently
between two units, or for equipment connected to a PC COM port. This is only true when the units are
connected. Only the data transmitting signals are provided at this port.
Figure 21. Transparent Data Port Pin Assignments in RS-232 Mode
1 2 3 4 5
6 7 8 9
VIEWED FROM SOLDERING
SIDE OF PLUG
Pin
1
2
3
4
5
6
7
8
9
Name
-
RXD
TXD
-
GND
-
-
-
-
Direction
Input
Output
Description
N.C.
Receive Data
Transmit Data
N.C.
Ground
N.C.
N.C.
N.C.
N.C.