Huawei NetCol5000-A User Manual page 84

NetCol5000-A 42 kW Air Cooled In-row Precision Air
Conditioner
User Manual
Connecting the RS485 Monitoring Network Cable (Modbus-RTU)
When the CAN teamwork networking is used inside the air conditioners, connect the external
monitoring network cable to the RS485 port on the air conditioner. To use the northbound
RS485 monitoring, the communications protocol should be Modbus-TCP.
When monitoring air conditioners over northbound RS485, the EMS needs 3 seconds to
collect data from one air conditioner. Therefore, the time required for collecting data from N
air conditioners in a group is 3 x N. If the data collection time is longer than the performance
requirement, you can divide the air conditioners into several groups. For example, if the EMS
needs to finish data collection in 12 seconds, you are advised to group air conditioners by four
and connect the COM port of the main control module of the first air conditioner in each
group to the RS485 port of the EMS.
Step 1 (Optional) Make the RS485 monitoring network cable by referring to
onsite.
Step 2 Group air conditioners for monitoring based on performance requirements and connect the
monitoring network cables, as shown in



Table 3-12 DIP switch settings
Toggle
Switch
1
2
3
4
Issue 01 (2017-07-27)
Monitoring grouping of air conditioners can be achieved through the toggle switches on
the main control module. For details, see
The following figure shows the connection diagram when 32 air conditioners grouped by
four are connected to the EMS. The customer can adjust the number of air conditioners in
each group based on performance requirements.
Set the northbound RS485 grouping switches (namely, toggle switches 2 and 3) for the last
air conditioner of each group (namely, air conditioner 4, air conditioner 8, ..., air
conditioner 28) to OFF, except the air conditioner in the end, that is, air conditioner 32.
Retain the default settings of other toggle switches.
Default Operation Description
Value

OFF

Monitoring grouping switch. If you need to enable the monitoring
ON
of northbound devices by group, flip toggle switches 2 and 3 to
ON
OFF. For details, see
OFF This toggle switch determines whether to restore factory defaults.
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Figure 3-51.
Table 3-12.
Non-teamwork situations: Retain the OFF state.
Teamwork situations: Flip toggle switch 1 of the first and last
precision air conditioners in the network to ON, and toggle
switch 1 of other air conditioners to OFF.
Figure
3 Installation Guide
Figure 3-47
3-51.
if required
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