RS**5 Module Make Your Arduino Talk with Each Other
In your project, is there any requirement to achieve communication or data transmission among your Arduino? Or do you want to make your Arduino talk with each other?
The RS**5 can help you to make it come true, RS**5 serial bus interface standard transmiss signal through difference balance, have very strong resistance ability to common mode interference, allows one transmitter to drive multiple load equipments on a pair of twisted pair. In theory, the communication distance is ***0 meters, the rate speed can be as fast as *0 Mbps, and it can keep normal work in strong noise environment.
The biggest advantages of RS**5 is the simple programming, because you only need to use Arduino own Serial library, that is enough.
RS**5 in essence is a kind of serial protocol, so when RS**5 electronic module is used to connect Arduino, it need to take Arduino serial interface. Arduino sensor module has COM interface which is specifical for electronic Module with serial interface, so we just only need to use a 4 pin cable to connect RS**5 module with Arudino sensor module.
There are two green terminal "+" and "-" on the top of RS**5 module which is used for 5V power supply, when multiple RS**5 module cascade, you can join all of green terminal "+" and "-" of RS**5 module together, so that, on the whole, only need to give one of the grafted in 5 V power supply is ok.
Just said to cascade power supply, there are two green terminal "A" and "B" at the buttom of RS**5 module which is used to realize cascade connection function. You can use any of the connecting cable to connect the first "A" and "B" interface of RS**5 module respectively with the second "A" and "B" interface of RS**5 module.
On the left of RS**5 module, there are two black terminal "OUTPUT" and "INPUT", it is the telephone wire connection interface. When RS**5 module need cascade function, we only need to connect one OUTPUT interface of RS**5 module with another OUTPUT interface of RS**5 module, then it will be ok.
On RS**5 serial interface module, another switch need to cause our attention is marked as "TR" switch, it is used to control terminal resistance, the purpose is to absorb reflected signal from RS**5 network, in order to protect the normal transmission signal from interference. But this resistance can only be used on the final equipment module of RS**5 bus, this is the reason why we call it as terminal resistance. In the connection, only need to set the "TR" switch of final equipment RS**5 module to "ON" position. While other RS**5 module are going to be set to the opposite position from "ON".
Below TR switch, there are another two switch which are called "O +" and "O -". When several RS**5 modules cascade with power supply, while there are modules cascade too many to cause undervoltage of the RS**5 module. But when we use telephone lines to achieve RS**5 module cascade, because the telephone line four line is "bound" together, so we can't like use on the top of the green terminal, as long as we connected or disconnected the corresponding port, then it will be alright.
"O +" and "O -" switch is designed to solve this problem. Only when the "O +" and "O -" switch is at the "ON" position, cascade power supply can take effect.
In other words, when the "O +" and "O -" switch is set to the opposite position from "ON", cascade power supply can not take effect, then it need to insert external power supply at the position of "+" and "-" of this RS**5 module. Thus it can achieve several RS**5 modules cascade with power supply.
In the lower right corner of RS**5 there is a "L1" lamp. This small LED connect with an automatic transceiver detection circuit, when there is data transmission, it will light up, so it is used as indicator for data transmission.