61
l
Data Log
Click the box to select a certain interval to record operation
data of the rack powers.
There are 9 options:
1Min, 2Min, 5 Min, 10 Min, 20 Min, 30
Min, 40 Min, 50Min, 1Hr
1Min
. (Default:
)
Clicking can remove data log recorded.
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Event Log
Clicking can remove event log recorded.
Clera Data Log
Clera Data Log
Clera Data Log
5
5.2.7 LOG
The LOG page provides data log and event log functions, allowing
users to confirm the usage of system power.
Note: Please install SD card to enable log function.
5
5. Modbus TCP Interface
3
MODBUS Client
The device supports Modbus TCP communication protocol. Clients
are able to read and write parameters of the CMU2C (server) through
the protocol, including remote ON/OFF, output voltage/current
setting, PSU internal temperature reading, etc. During data transfer,
please follow the principle of first sending the Hi byte and then the Lo
byte.
All Modbus/TCP Message Frames are sent via TCP on registered port
502. For the IP Address, please refer to Network page of the CMU2
5.3.2 Modbus Frame Encapsulation
Modbus TCP message framing consists of MBAP Header,
Function Code and Data.
MBAP Header (7bytes)：It is a dedicated header that is used on
TCP/IP to identify the MODBUS
Application Data Unit.
Function code (1byte)：The function codes are used to tell the
server what kind of action to perform.
Data (N bytes)：For data exchange, contents and data length
are dependent on different function codes.
Confirmation
Request
Response
Indication
MBAP Header
7 bytes
Function Code
1 byte
Data
N bytes
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5.3.1 Communication Timing
Min. request period (Controller(client) to CMU2(Server)): 20mSec。
Max. response time (CMU2(Server) to Controller(client)): 5mSec。
Min. packet margin time (Controller(client) to CMU2(Server)):
5mSec。
Controller
(Client)
CMU2 (Server)
Request period
(Controller to CMU2)
Response time
(CMU2 to Controller)
RX data
TX data
RX data
Packet Margin time
(Controller to CMU2)
MODBUS Server
(CMU2)
