USER'S MANUAL
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ITEM
3
Stop Bit
The stop bit setting determines the last part of the data frame. These bits are always represented
by a negative voltage and will determine when data transmission will cease. The options for the
stop bits are 1, 1.5, and 2 bits.
ITEM
4
Parity
The parity bit is used as a simple method of error checking. This option specifies whether the
parity of the transmission will be None, Odd, or Even bits. Suppose the parity is chosen to be
odd. The transmitter will then set the parity bit in such a way as to make an odd number of 1's
among the data bits and the parity bit.
The keyboard control port is located on the rear panel of the DVR next to the PTZ controller input pins.
The keyboard control pins are labeled as KBD. This port is used for external DVR control devices
(optional). The external DVR control device is used as an alternative method to operate the DVR.
Please contact the vendor or distributor you purchased the DVR from to inquire about the detailed
specifications and usage of the external controller. This section will discuss settings used by this feature.
Figure
97
ITEM
1
Protocol
ITEM
2
Control ID
The control ID is used to specify which ID type, indicated by a number, will be used for the
external controller. This is similar to the settings of a PTZ ID.
ITEM
3
Baud Rate
The baud rate setting is used to determine the speed setting between the DVR and external
controller using the RS-485 KBD port. The KBD port uses two voltage states commonly known as
MARK (negative) and SPACE (positive).
ITEM
4
Data Bits
The data bit setting is used to determine the order of transmission for the least significant bit
(LSB) to the most significant bit (MSB). The optional settings are from 5 to 8 bits.
ITEM
5
Stop Bits
The stop bit setting determines the last part of the data frame. These bits are always represented
by a negative voltage and will determine when data transmission will cease. The options for the
stop bits are 1, 1.5, and 2 bits.
ITEM
6
Parity
The parity bit is used as a simple method of error checking. This option specifies whether the
parity of the transmission will be None, Odd, or Even bits. Suppose the parity is chosen to be
odd. The transmitter will then set the parity bit in such a way as to make an odd number of 1's
among the data bits and the parity bit.
CHAPTER 15. DEVICE
4. Keyboard Control (RS-485)
Item
1
Protocol
Item
3
Baud
Rate
Item
5
Stop
Bits
Item
2
Control
ID
Item
4
Data
Bits
Item
6
Parity
Item
7
Cancel
Item
8
Save
Item
9
Default
Summary of Contents for H.264 Digital Video Recorder
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