Modbus - Operations - M-system 53U Operating Manual

MODBUS - OPERATIONS

Modbus registers are assigned to program and operate the unit via Modbus network. It can also disable the view switching
control via the front keys to fix the display view to a specific parameter combination.
■ MODBUS REGISTER ACCESS SETTING
ADDR. WORD PARAMETER
Deactivate Modbus register writing protection 1.01
4943 2
Writing a preset passcode in this register deactivates the writing protection via Modbus.
When the Modbus passcode set in this register matches the preset one, setting '1' or '2' in the address 4945
becomes available to enable writing in Modbus registers.
Reading out the register value is not possible. It reads always '-1' regardless of the code setting.
After writing is complete, be sure to set a value other than the passcode ('0' is recommended) to activate the
writing protection again.
4945 1 Modbus register access setting
0 : Write disable (*)
1 : Write enable
2 : Write enable the count values
Other : Write disable
This setting is erased when the power supply to the unit is removed. It always starts with '0' (Write disable)
when the power supply is turned on. Set '1' or '2' before starting writing at other registers.
In order to write a count value (e.g. active energy), set '2' at this register address. When it is set, the unit
stops counting so that a new count value can be written in the register address. Be careful to use '2' setting
because no counting will be performed if the unit remains with this setting.
When the Modbus register writing protection is enabled, this register setting cannot be changed from '0' to
'1' or '2' unless a correct security code is set in the address 4943.
(*) Factory setting
■ USER OPERATIONS
User operations include switching the display views and resetting alarm trips.
ADDR. WORD PARAMETER
5201 1 Key operation lock
0 : All key operations available (*)
1 : All key operations locked
2 : Lock the key operation to go to Setting mode only
5202 1 Data reading display
Shows the parameter set displayed on the three data displays. The display can be switched by writing at
this address from the host.
5203 1 Energy reading display
Shows the parameter type displayed on the bottom data display. The display can be switched by writing at
this address from the host.
5204 1 Energy reading display unit
0 : 0.1 kWh, 0.1 kvarh, 0.1 kVA (*)
1 : 0.1 Wh, 0.1 varh, 0.1 VA
Shows the unit (factor) of the parameter on the energy display (k = kilo). The display unit can be switched
by writing at this address from the host.
Exception: Count time (unit: h) is displayed always 'without kilo'.
5205 1 Reset alarm trip
1 : Reset
Automatic Σ view switching
0 : No resetting
5206 1
1 : Enable automatic switching: Σ1 through Σ4 switched in 10 second intervals. Automatic switching is can-
0 : Disable automatic switching (*)
celled when one of the front control buttons are touched.
(*) Factory setting
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Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: info@m-system.co.jp
53U
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