TTL信号与485差分信号互转模块使用说明

 

Type: TH2010-485MD

 

One.Module parameters

     Working voltage: DC12V or DC24V

      Operating Current: <10mA

      Operating Temperature: -20 ° C - 60 ° C

      Transmission distance: 200 meters

      Transfer rate: 115200bps

      Within the board size: L40, * W26 * from H15 mm (circuit board can be mounted to the 26MM width of the barrier tube slot to do the waterproofing)

      Shell Size: L60 * W35 * H25 mm

 

Two.Module function

      TTL signal can be converted to a differential signal or differential signal converted to a TTL signal.

      TTL signals: digital circuits use the binary number "0", "1" to represent. "Logic 0" represents the TTL level 0V, logic 1 on behalf of the TTL level 5V signal is a TTL signal.

      The differential signal: differential signal can be understood as the analog signal, it is a value to represent the physical difference between the two points. Here can be understood as the voltage difference between the 2:00.

      

Three. Module, role

     TTL signal can not be long-distance transmission, convert the differential signal can be achieved after long-distance transmission. Of course, at the other end of the debit must then "differential signal" to restore into a TTL signal can be identified.



     1 Why should the TTL signal "turn into a differential signal?

         TTL signal "can not be long-distance transmission of the TTL signal into a digital signal 0 and 1, must follow the TTL-level rules (high and low voltage limit lower limit threshold rule), the signal during transmission will be the pressure drop loss, when the distancetoo far when the pressure drop loss of, for example, sent to reach the high signal loss after TTL high threshold voltage threshold ", it will result in the recipient receives a low signal.so that data transmission errors.

The differential signal is an analog of 2:00 there is a small voltage difference, after the module conversion parse the difference is positive that is high, the difference is negative can be considered is low.

     2 Why should the "differential signal" turn into a TTL signal "?

          Because of the differential signal is analog can not be some control equipment and chip identification, must be converted into TTL signals can be identified.

 

 

Four. The Module picture

              Bare board picture:

 

            Shell picture: