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.
► Perform the following steps:
1. Remove the terminal block plug from the rear of the device.
2. Connect a twisted pair cable to the terminal block plug as shown below.
Chapter 2: Installing the Single-and Dual-Port Devices
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