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SN75176A/B Issue

Other Parts Discussed in Thread: SN75176A, SN75176B

Hi Team,

 

Good day!

 

One of my customers faced an issue using our SN75176 for their RS485 communications.

 

Here’s the summary of the issue that they were encountering with the SN75176:

 

Master:

  • ·         Baudrate: 115200
  • ·         RE Pin: Tied to GND
  • ·         DE Pin: Tied to VDD

Slave:

  • ·         Baudrate: 115200
  • ·         RE Pin: Controlled by MCU
  • ·         DE Pin: Controlled by MCU

 

Master

Slave

Remarks

SN75176A

SN75176A

Master cannot receive correctly from the slave.

 

Slave can receive data from the master correctly.

SN75176B

SN75176B

Doesn’t communicate correctly.

 

Here is also the schamtic of their master and slave:

Master

Slave

Please help advise on what can cause this issue?

Thanks!

Regards,

Alfred