文档介绍：1 摄像机使用手册摄像机 V8 系列是一款基于 RS485 总线、 RS232 接口的高性能的彩色监控终端, 为了实现在某些不需要实时监控的场合,通过 RS-485 、 RS232 接口实现图像监控。总线采用半双工通信,可支持 7台设备实现多点监控。 Figure 1– System block diagram Features ? Small in size, low cost and low powered () camera module for high-resolution serial bus security system or PDA accessory applications. ? On-board EEPROM provides mand-based interface to external host via RS-232 ? UART: for transferring JPEG still pictures or 160x128 preview ***@8bpp with ? On board OmniVision OV 7725 VGA color sensor ? Built-in JPEG CODEC for different resolutions ? Built-in down sampling, clamping and windowing circuits for VGA, QVGA, 160x120 or 80x60 image resolutions ? Built-in color conversion circuits for 2-bit gray, 4-bir gray, 8-bit gray, 12-bit RGB, 16-bit RGB or standard JPEG preview images. ? No external DRAM required. Serial Interface 1. Single Byte Timing Diagram A single byte RS-232 transmission consists of the start bit, 8-bit contents and the stop bit. A start bit is always 0, while a stop bit is always 1. LSB is sent out first and is right after the start bit. 2 2. Command Timing Diagram A mand consists of6 continuous single byte RS-232 transmissions. The following is an example of SYNC (AA0D00000000h) command. 3 4P端子定义: (拨开热所管,从线的方向看端子) 1234 摄像头接收( RXD ) 电源地 DC 5V 摄像头发送( TXD ) 绿色黑色红色黄色 2143 4 通讯基本参数: RS485 半双工模式传输,参数设置如下: 单字节时序: ?波特率:自适应?数据位:8?停止位:1 ?校验位:无所有通讯指