The maximum cable length supported by the SN65HVD11SJD depends on the baud rate and the type of cable used. As a general guideline, the maximum cable length for a baud rate of 1 Mbps is around 100 meters, while for a baud rate of 100 kbps, it can be up to 500 meters.
To ensure reliable communication over long distances, it is recommended to use a twisted-pair cable, keep the transmitter and receiver grounds connected, and use a common-mode choke or ferrite bead to reduce electromagnetic interference (EMI). Additionally, consider using a repeater or an isolator to boost the signal and improve noise immunity.
The main difference between the SN65HVD11SJD and the SN65HVD12SJD is the number of transceivers. The SN65HVD11SJD has one transceiver, while the SN65HVD12SJD has two transceivers. The SN65HVD12SJD is suitable for applications that require two separate RS-485 buses or for connecting multiple devices to a single bus.
Yes, the SN65HVD11SJD can be used for half-duplex communication. In half-duplex mode, the device can transmit and receive data, but not simultaneously. The DE (driver enable) pin can be used to control the direction of data transmission.
To protect the SN65HVD11SJD from overvoltage and ESD, it is recommended to use a TVS (transient voltage suppressor) diode or a surge protector at the input pins. Additionally, follow proper PCB design and layout guidelines to minimize the risk of ESD damage.
SN65HVD11SJD datasheet
by Texas Instruments
