The maximum cable length depends on the baud rate and the type of cable used. As a general rule, the cable length should be limited to 100 meters or less for baud rates above 9600. For lower baud rates, longer cable lengths may be possible, but it's recommended to consult the RS-485 standard and perform signal integrity analysis to ensure reliable communication.
Yes, the SN75HVD10DG4 can be used in a multi-point configuration, but it's essential to ensure that the total bus load does not exceed the recommended maximum of 60 units. A unit load is defined as a device that presents a load impedance of 60 Ω to the bus. Exceeding the maximum bus load can cause signal degradation and errors.
Proper termination of the RS-485 bus is crucial to prevent signal reflections and ensure reliable communication. A 120 Ω termination resistor should be connected between the differential lines (A and B) at each end of the bus. Additionally, it's recommended to use a biasing network to maintain a stable common-mode voltage on the bus.
The SN75HVD10DG4 can support data rates up to 50 Mbps, but the actual achievable data rate depends on the cable length, baud rate, and system noise. It's recommended to consult the datasheet and perform signal integrity analysis to determine the maximum data rate for a specific application.
The SN75HVD10DG4 is a half-duplex transceiver, meaning it can only transmit or receive data at a given time. It's not designed for full-duplex operation, where simultaneous transmission and reception occur. If full-duplex operation is required, a different transceiver or a separate transmitter and receiver pair should be used.
SN75HVD10DG4 datasheet
by Texas Instruments
