User guide

Connecting a Serial Device

RS-232, RS-422 and RS-485 are communication standards between a Data

Terminal Equipment (DTE) and a Data Circuit-terminating Equipment (DCE)

using the asynchronous serial communication method.

Most serial equipments such as PTZ cameras, keyboards, matrixs,

multiplexers, or access cards conform to the RS-232 or RS-422/485 standards.

The S1800e series devices supports the RS-232, RS-422, and RS-485

asynchronous protocols using pluggable screw-terminal strips. For any other

protocol, you may need a converter.

Note

The S1800e series devices come with a terminal block plug to attach RS-232,

RS-422/485 devices to the S1800e series.

Connecting RS-232 Devices

The RS-232 standard is used in some analog cameras and computer serial

ports. Before connecting the S1800e series device to a RS-232 serial

equipment, you need to determine if they are data terminal equipment (DTE) or

data communication equipment (DCE).

When connecting two modules of the same type, you have to cross the data

wires to create a communication. On the other hand, when connecting a DTE

with a DCE, a straight cable is required.

Connecting a Serial Device