USR-DR504-E User Manual
Jinan USR IOT Technology Limited
Tech Support: h.usriot.com
13
Baud rate
2400,4800,9600,14400,19200,28800,33600,38400,57600
,115200,230400,460800
Data bit
8
Stop bit
1,2
Check bit
NONE
EVEN
ODD
Form 2.2.1-1 Serial Parameters
2.2.2. Frame forming mechanism
2. 2. 2. 1 Time trigger
When DR504-E receives data from the UART, it continuously checks the interval of two adjacent bytes. If the
interval time is greater or equal to a certain "time threshold", then a frame is considered finished, otherwise the data is
received until greater or equal to the packet length byte set. This frame is sent to the network as a TCP or UDP packet.
The "time threshold" here is the time between packages. The range of settable is 100ms~60000ms. Factory default:
100ms.
This parameter can be set by AT command, AT+UARTFT=<time>.
Diagram 2.2.2.1-1 Time trigger
2. 2. 2. 2 Length trigger
When DR504-E receives data from the UART, it constantly checks the number of bytes received. If the number of
bytes received is equal to a certain "length threshold", a frame is considered to have ended, otherwise the packaging
time is waiting for the end. This frame is sent to the network as a TCP or UDP packet. The "length threshold" here is the
package length. The settable range is 100~1000. Factory default 1000.
Note: when using “command paAT command” function, the package length must be larger than the “command
paAT command”, otherwise AT command is invalid
This parameter can be set by AT command, AT+UARTFL=<length>.
