The maximum cable length for the DS485N is dependent on the baud rate and the type of cable used. As a general rule, the maximum cable length is 4000 feet (1219 meters) at 9600 bps, 2000 feet (610 meters) at 19,200 bps, and 1000 feet (305 meters) at 38,400 bps.
Yes, the DS485N can be used in a multi-master configuration. However, it is essential to ensure that only one master is transmitting at a time to avoid data corruption and bus conflicts.
To handle bus contention and collisions, it is recommended to implement a collision detection and automatic retransmission mechanism in the software. This can be done using a protocol such as RS-485 with 9-bit addressing and a token-passing mechanism.
The minimum number of devices required to terminate the bus is two, one at each end of the bus. This is to ensure that the bus is properly terminated and to prevent signal reflections.
Yes, the DS485N can be used in a point-to-point configuration. In this case, the DE (driver enable) pin can be tied high to enable the driver continuously, and the RE (receiver enable) pin can be tied low to disable the receiver.
DS485N datasheet
by Texas Instruments
