SERIAL AND PARALLEL COMMUNICATIONS

In addition to the computers connected to a local area network, there are other connected devices such as printers, ploters, scanners, etc.

In some industrial sectors it is very common to gather data from certain departments or from production processes in central computers. For this type of industrial communication usually communication standards like RS485 or RS232, for instance, are used.

Some of these communication standards allow several devices to be connected to the same bus. In the case that one device receives the impact of a surge voltage, a chain reaction may happen when the surge voltage is propagated within the network, up to producing important damage to the local area network.

This damage can be avoided by installing appropriate protections agains surge voltages.

 

Serial and parallel communication
SUB-D25			SUB-D15			SUB-D9
Protector	kA	Wires	Protector	kA	Wires	Protector	kA	Wires
DB25-232/2 DB25-232/4 DB25-232/7 DDB25 DDB25-ALL DDB25-PARALLEL	10 10 10 0,34 0,34 0,34	2 2 7 9 25 25	DDB-15 DB15-V11	10 10	15 4	DB9-232/4 DDB9 DB9-V11 ESP	10 0,34 10	4 9 4
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Protectors recommended for pheripherals of local area networks