The maximum cable length supported by the SN65HVD35DRG4 depends on the baud rate and the type of cable used. As a general guideline, the device can support cable lengths up to 100 meters at lower baud rates (e.g., 9600 bps) and up to 10 meters at higher baud rates (e.g., 115200 bps). However, it's recommended to consult the application note 'TIA/EIA-485 (RS-485) Cable Length and Bit Rate' (SLAA701) for more detailed information.
To ensure reliable communication in noisy environments, it's essential to follow proper PCB layout and design practices, such as using a ground plane, separating the RS-485 bus from other signals, and using shielding or twisted-pair cables. Additionally, consider using a common-mode choke or a ferrite bead to filter out electromagnetic interference (EMI). It's also recommended to use a termination resistor at the end of the bus to prevent signal reflections.
The main difference between the SN65HVD35DRG4 and the SN65HVD72DRG4 is the number of receivers and transmitters. The SN65HVD35DRG4 has one transmitter and one receiver, while the SN65HVD72DRG4 has two transmitters and two receivers. The SN65HVD72DRG4 is suitable for applications that require multiple transmitters and receivers, such as in a repeater or hub configuration.
Yes, the SN65HVD35DRG4 can be used in a half-duplex configuration. To do so, connect the DE (driver enable) pin to the RE (receiver enable) pin, and use a single twisted-pair cable for both transmission and reception. This configuration is suitable for applications where data is transmitted in one direction at a time.
The recommended termination scheme for the SN65HVD35DRG4 is to use a 120-ohm termination resistor at the end of the bus, as close to the last receiver as possible. This helps to prevent signal reflections and ensures reliable communication. Additionally, consider using a biasing network to maintain a stable common-mode voltage on the bus.
SN65HVD35DRG4 datasheet
by Texas Instruments
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