Design considerations for RS232 interfaces are discussed.
RS232 interface design
When designing an RS232 interface, it is necessary to conform to standards published by the Electronics Industry Association, EIA RS232.V28. Some key specifications are summarized in Table 402.1. However, the EIA specifications are often just the beginning of the design. Practical problems such as generating RS232 signal levels, providing sufficient load drive, and ensuring protection against fault conditions must also be considered.
Key RS232 Transceiver Specifications (EIA RS232C. V28)