ashley
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As other input interfaces for projection, the RS232C serial port may be strange to everyone. In fact, you have only seen it without knowing its name. The following landlord will bring you in-depth understanding of what is the RS232C interface of the projector, and what role does it have? ?
1. What is RS232C serial port
The RS232C serial port, the full name is the EIA-RS-232C standard, specifies electrical characteristics, logic levels, and various signal line functions.
2. Introduction
The full name of the RS-232C standard (protocol) is the EIA-RS-232C standard, of which EIA (Electronic Industry Association) represents the American Electronics Industry Association, RS (Recommended standard) represents the recommended standard, 232 is the identification number, and C represents the latest one Modified (1969), before this, there are RS232B, RS232A. . It specifies the connection cable and mechanical, electrical characteristics, signal functions and transmission process.
Common physical standards are EIA? RS-232-C, EIA? RS-422-A, EIA? RS-423A, EIA? RS-485. Here only introduces EIA? RS-232-C (referred to as 232, RS232) . The computer input and output interface is the most common serial interface. RS-232C stipulates that the standard interface has 25 lines, 4 data lines, 11 control lines, 3 timing lines, 7 spare and undefined lines. The only commonly used ones are Nine, commonly used with 25-pin D-sub ports, its maximum transmission rate is 20kbps, and the maximum cable length is 15 meters. The RS232C port is used to input computer signals to control the projector.
Third, the prescribed standards
In order to achieve serial communication, the PC usually has two serial interfaces that comply with the RS-232C standard and uses a serial controller composed of a universal asynchronous receiver / transmitter control chip UART to handle the transmission and reception of serial data. PC The serial interface on the machine usually uses a 25-core or 9-core DB-25 or DB-9 connector, which is mainly used to connect MODEM equipment to work. Therefore, the RS-232C standard specifies many MODEM dedicated interface leads.
The above is the detailed explanation about the projector's RS232C serial port! If you have different views, you can also discuss with the landlord in the message area below.
1. What is RS232C serial port
The RS232C serial port, the full name is the EIA-RS-232C standard, specifies electrical characteristics, logic levels, and various signal line functions.
2. Introduction
The full name of the RS-232C standard (protocol) is the EIA-RS-232C standard, of which EIA (Electronic Industry Association) represents the American Electronics Industry Association, RS (Recommended standard) represents the recommended standard, 232 is the identification number, and C represents the latest one Modified (1969), before this, there are RS232B, RS232A. . It specifies the connection cable and mechanical, electrical characteristics, signal functions and transmission process.
Common physical standards are EIA? RS-232-C, EIA? RS-422-A, EIA? RS-423A, EIA? RS-485. Here only introduces EIA? RS-232-C (referred to as 232, RS232) . The computer input and output interface is the most common serial interface. RS-232C stipulates that the standard interface has 25 lines, 4 data lines, 11 control lines, 3 timing lines, 7 spare and undefined lines. The only commonly used ones are Nine, commonly used with 25-pin D-sub ports, its maximum transmission rate is 20kbps, and the maximum cable length is 15 meters. The RS232C port is used to input computer signals to control the projector.
Third, the prescribed standards
On TxD and RxD: logic 1 (MARK) = -3V ~ -15V
logic 0 (SPACE) = +3 ~ + 15V
on RTS, CTS, DSR, DTR and DCD control lines: the
signal is valid On, ON state, positive voltage) = + 3V ～ + 15V
signal is invalid (off, OFF state, negative voltage) = -3V ～ -15V
In order to achieve serial communication, the PC usually has two serial interfaces that comply with the RS-232C standard and uses a serial controller composed of a universal asynchronous receiver / transmitter control chip UART to handle the transmission and reception of serial data. PC The serial interface on the machine usually uses a 25-core or 9-core DB-25 or DB-9 connector, which is mainly used to connect MODEM equipment to work. Therefore, the RS-232C standard specifies many MODEM dedicated interface leads.
The above is the detailed explanation about the projector's RS232C serial port! If you have different views, you can also discuss with the landlord in the message area below.
