rs232c pinout

communication program. Test, with 1 PCs as the main station, another PC simulation of the work of 32 sub stations, two PCs using rs232c serial communication. To the main station communication demo program forms (form) to add 1 communication controls, 2 timer controls and a command button control, communication controls (MSCOMM1) used to access the serial port, send and receive data; Periodic timer control (periodic) Used to control the sending of per

anti-jamming ability to transmit the signal thousands of meters, and 232 can only transmit more than 10 meters. Modbus is just one kind of communication protocol, like Chinese and English, is a language of communication, a language of communication between machines. Then there must be a bridge of communication before the exchange, that is the transmission medium 485 or 232 or other electrical rules, the same protocol can be used in different transmission media such as 485 or 232 but the same tr