Caimore CM550-5 Series User Manual page 40

the serial port will be unable to communicate.
 Stop bit: Please set the stop bit to match the stop bit of the user terminal. Otherwise the
serial port will be unable to communicate.
 Device ID: A eight hex number for server to identify different DTU.
 SIM Num: A eleven decimal number for server to identify different DTU.
 Frame Interval:
DTU packets packet rules are as follows:
1. When the data length received from the serial port exceeds the specified
buffer size (2048bytes), DTU will pack the data received and send it to the central
server.
2. When DTU device fails to receive serial data within the set "data frame
interval" time, DTU will pack the data received and send it to the central server.
The "data frame interval" time is set too small, which may cause a packet to be divided
into multiple packets; Too much time can cause two or more packets to be packaged
into one packet and sent to the central server at once.
 Interval of Keepalive: The interval between periodic sending of online monitoring
data to maintain the link. Unit: seconds. The default value is 60 seconds. It is suggested
that the heartbeat time should not be set too small, too small will lead to the increase of
traffic, not too large, too large led to equipment dropped for a long time before
monitoring. Recommended value 10~120s.
 Register Packet: When the connection is established between DTU and the central
server, DTU will send registration information to the center. If the registration package
needs special definition, the customer needs to custom it according to actual situation.
 Keepalive Packet: After DTU is connected to the server, if no data is sent for a certain
period of time, the server will automatically disconnect the connection with DTU. In
order to maintain the connection between DTU and server, heartbeat packet data will be
sent to the data center on a periodic basis.
 None: Don't to send heartbeat packet.
 Use default: Send default packet.
 Self Define: User can define a heartbeat packet according to actual situation.
 Keepalive Packet Escape: Character escape to distinguish between user data and
heartbeat packet data.
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