4 Configuring the device
4.4 MODBUS register
36
NZM-XMC Measuring and Communication Module
11/16 MN01219001Z-EN
www.eaton.com
4.4.3 Communication (RS485) setup
For the communication (RS485) registers 1000 to 1002 are used.
4.4.4 Configuring the transformer ratio
The NZM-XMC-TC-MB universal module can perform current and voltage
measurements with transformers. The transformer ratio must be entered for
this purpose.
If the voltage is connected directly without a transformer, a value of 1 must
be entered into registers 1100 and 1101; a value of 1 must also be entered
into register 1102 for the secondary voltage.
For currents, the device will always assume a ratio of X:5. Because of this,
only the primary current needs to be entered into register 1103.
Example
Say you want to measure a maximum current of 250 A, so you use a 300/5 A
transformer and write a value of 300 to register 1103 (FC 16).
In order to activate the value, you would then have to write TRUE directly to
coil 2000 as the next frame (FC 5).
Register
Variable
Value range
Value range
NZM-XMC
NZM-XMC-TC-MB
1000H
1)
Protocol
0 - Modbus
0 - Modbus
1000L
2)
Device address
1 - 255 (default: 2)
1 - 255 (default: 2)
1001H
1)
Baud rate
0: 9600 Bit/s (default)
1: 19200 Bit/s
2: 38400 Bit/s
0: 9600 Bit/s (default)
1: 19200 Bit/s
1001L
2)
Parity
0: no (default)
1: odd
2: flat
0: no (default)
1: odd
2: flat
1002H
1)
Data bits
1 - 8 Bit
1 - 8 Bit
1002L
2)
Stop bits
0: 1 Bit (default)
1: 2 Bits
0: 1 Bit (default)
1: 2 Bits
1) H = High byte
2) L = Low byte
￫
In order to activate the changes, write TRUE to coil 2000 as the
next frame.
Register
Variable
Value range
1100, 1101
Primary voltage
0 - 100000
1102
Secondary voltage
0 - 999
1103
Primary current
0 - 10000
1105H
1)
0 - THD / 01 - D
1) H = High byte
