gherkins
Newbie level 5

Hello everyone!
there is a small question of application MAX485.
Probably somebody knows or can explain the first variant of application:
Probably somebody knows or can explain the second one:
In the first application I am interesting in why they use shottky diode with pins 2,3 together. Is it application of constant transmission?
In the second application I am interesting in why the all the pins 2,3,4 sit on the ground there. Is it application of constant receiving?
thanks in advance!
there is a small question of application MAX485.
Probably somebody knows or can explain the first variant of application:

Probably somebody knows or can explain the second one:

In the first application I am interesting in why they use shottky diode with pins 2,3 together. Is it application of constant transmission?
In the second application I am interesting in why the all the pins 2,3,4 sit on the ground there. Is it application of constant receiving?
thanks in advance!
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