green field county stadium is planning to conduct a cricket match between two teams a and b. a large crowd is expected in the stadium as 1 tickets have already been sold. to fulfill the viewers’ requirements, the match administrators are willing to install large display screens inside the stadium which should display the match “live” through several cameras installed on different angles in the stadium.

after carefully reading and analyzing the given scenario, you are required to suggest the “most suitable serial transmission mode” with two strong reasons.

note: format of your answer should be as follow:

mode name:

reason 1:

reason 2:

RS422-A or RS-485

Explanation:

Mode Name: RS422-A

Well, this is the electrical interface. The microprocessor covers the logics to electrical signals, and these electrical signals are then transmitted over a long distance, which is less than 4000 feet through RS422-A. And this is a half-duplex mode with the multidrop receiver and one transmitter at a time, in master-slave format. A receiver is a slave and the transmitter is a master. And there can only be one transmitter at a time. Here, a PC collects the videos from all cameras, through a unified system, and this PC is connected to numerous receivers which are the Screens. Parallel transmission cannot be done over a single line, and it's noisy as well, and hence we stick to serial mode. and here half-duplex as one at a time need to deliver, and not both. Hence, RS422-A is the first mode. which is a half-duplex serial transmission mode.

Reason 1:

It's noiseless

Reason 2:

The number of receivers can be as high as 10.

As the second alternative option:

Mode Name: RS-485

This is even better and allows receivers as high in number as 32, and hence is better than RS-422A. The maximum distance allowed is around 4000 feet, and the rest is the same as RS-422A. it also supports half-duplex.

Reason 1: It's less noisy and even better than RS422-A

Reason 2: number of receivers, and as high as 32 are allowed.

Remember, however, Ethernet is a low distance network, though it also supports collision detection, and multiple access/ carrier detection or CSMA/CD. However, for this question requirement RS-422A and RS-485 network interface will work fine. In the case of ethernet, we have an Ethernet Interface card, which works as an Ethernet network interface. However, Ethernet is a short distance, and will not work here.