D-Link DCS-3430 Product Manual - Page 48

Section 3 - Configuration RS-485 You may configure the RS-485 settings or communication specifications (baud rate, data bit, stop bit, and parity bit) for your camera. RS-485 is a serial communication method for computers and devices. For your camera, RS-485 is used to control a PAN/TILT device, such as an external camera enclosure to perform PAN and TILT movement. Support PAN-TILT: When enabling Support PAN-TILT, a control panel will be displayed on the Live Video page allowing control through RS-485 for an external camera enclosure. Protocol: Select one protocol type from the pull-down menu. ID: Range from 1 to 255, is the identifier for each RS-485 devices. Baud Rate: Range from 2400 to 38400 bps. It is a speed measurement for communication between a transmitter and receiver, indicates the number of bit transfers per second. Higher baud rate will reduce the distance of the two devices (transmitter and receiver). By default, the value is 2400. Data Bit: Either 7 or 8. It is a measurement of the actual data bits in a transmission. By default, the value is 8. Stop Bit: Either 1 or 2. It is used to signal the end of communication for a single packet. The more bits used for stop bits, the greater the lenience in synchronizing the different clocks but the slower the data transmission rate. Bye default, the value is 1. Parity Bit: Choices of No, Even, and Odd. It is a simple form of error checking used in serial communication and you may use no parity. For even and odd parity, the serial port sets the parity bit (the last bit after the data bits) to a value to ensure that the transmission has an even or odd number of logic-high bits. For example, if the data is 011, for even parity, the parity bit is 0 to keep the number of logic-high bits even. If the parity is odd, the parity bit is 1, resulting in 3 logic-high bits. D-Link DCS-3411/3430 User Manual 48