The maximum cable length depends on the baud rate and the type of cable used. As a general rule, the maximum cable length is limited to 100 meters at 9600 bps and 10 meters at 1 Mbps. However, it's recommended to consult the RS-485 standard and perform signal integrity analysis to determine the maximum cable length for a specific application.
In a multi-point RS-485 network, it's recommended to use a termination resistor at each end of the bus to prevent signal reflections. The termination resistor value should be equal to the characteristic impedance of the cable, typically 120 ohms. Additionally, it's recommended to use a biasing network to maintain a stable logic level on the bus when no device is transmitting.
Yes, the SN65HVD485EDGKG4 can be used in half-duplex or simplex configurations. In half-duplex mode, the device can transmit and receive data, but not simultaneously. In simplex mode, the device can only transmit or receive data, but not both. The device's transmit and receive pins can be connected together to enable half-duplex operation.
The SN65HVD485EDGKG4 can support data rates up to 50 Mbps. However, the actual data rate achieved depends on the system design, cable length, and noise environment. It's recommended to consult the datasheet and perform signal integrity analysis to determine the maximum data rate for a specific application.
The SN65HVD485EDGKG4 has built-in ESD protection, but it's still recommended to take additional measures to protect the device from ESD and surge events. This can include using ESD protection devices, such as TVS diodes, and following proper PCB design and layout practices to minimize the risk of damage from ESD and surge events.
SN65HVD485EDGKG4 datasheet
by Texas Instruments
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