POWERMETER
EPR-04 / EPR-04S
5
EPM-04S COMPUTER CONNECTION
Dimensions
Type PK-26
60.6
106.0
58.0
53.0
26.5
21.5
10.0
45.0
8.5
14.0
90.0
7.6
9.5
30.1
10.8
Type PR 19 (96x96)
70mm
79.3mm
90mm
96mm
96mm
31 DEVICES CAN BE CONNECTED AT THE SAME LINE
GND
TR B
A
GND
TR B
A
GND
TR B
A
GND
B
A
RS485/RS232
CONVERTER
PC
...
EPM-04S-1
EPM-04S-2
EPM-04S-31
MAX. 1200 mt.
MAX. 247 DEVICES CAN BE CONNECTED AT SAME LINE BY USING REPEATER.
GND
TR B A
...
EPM-04S-247
GND
B
A
RS485/RS232
CONVERTER
PC
...
EPM-04S-1
EPM-04S-2
EPM-04S-31
REPEATER
MAX. 1200 mt.
MAX. 1200 mt.
POWERMETER
EPR-04 / EPR-04S
4
Specifications for data cable;
- 24 AWG or thicker
- Less than 100 ohm/ km
- Nominal characteristic impedance at 100 kHz of 100 ohms
- Less than 60 pF/m mutual capacitance (between two wires in a pair)
- Less than 120 pF/m mutual pair capacitance ( the capacitance
between one wire and all others connected to earth).
- Twisted Pair
ERROR CODES
(Available only for EPR-04S)
Slave device (EPR-04S) sends error message when receive any missing query.
Error codes are given below.
01 Invalid Function:
If any message except given above is used, then 01 error
messages will be sent.
02 Invalid Register:
Error 02 will be send when a reading of a register is
requested, except the registers which mentioned in table.
03 Invalid data:
If any different value is been set for dedicated Transformer values
and nonzero for demand value, then error message 03 will be sent.
Digital input are sent in 16 bit hexadecimal format as below:
If 12-48 V AC / DC is applied to ln1 (Input 1), 0 (zero) bit of DIN register is
set as 1. Otherwise, 0 (zero) bit is set as 0.
If 12-48 V AC / DC is applied to ln2 (Input 2), 1st bit of DIN register is set
as 1. Otherwise, 1st bit is set as 0.
The Parameters are sent in 32bit Hexadecimal format. For Example, 230.0V
voltage will be sent as 000008FCH. Cos
j
values shall be divided to 1000.
0.980 Cos
j
will be sent as 000003D4H. Energy values are sent in 64 bytes.
1234567890123456789 Wh = AB 54 A9 8C EB 1F 0A D2 Wh
Digital Inputs (Available only for EPM-04S)
Preset Multiple Register(10H) is used to set more then one register at same
time.
i.e.
Setting CT as 100, Ut as 20.0;
01 10 80 00 00 02 04 00 C8 00 64 XX XX
01 Device Address
10 Function
80 MSB address
00 LSB address
00 Register number MSB
02 Register number LSB
04 Byte count
00 Data MSB
C8 Data LSB
00 Data MSB
64 Data LSB
XX CRC MSB
XX CRC LSB
Preset Single Register (06) function is used for writting the setting values,
erasing the energy counter or resetting the min., max., demand values.
Current transformers ratio can be set 0-2000, voltage transformer ratio can
be set 1-40000. Min., Max. and Demand values can be only clear. If sent
value is outside of this range device responds with an error message.
i.e.
Setting CT as 100;
01 06 80 02 00 64 XX XX
01 Device address
06 Function
80 MSB address
02 LSB address
00 Data MSB
64 Data LSB
XX CRC MSB
XX CRC LSB
The T times corresponds to a time in which data must not be exchanged
on the communication bus to allow the connected devices to recognize the
end of one message and the beginning of another. This time must be at
least 3.5 characters at the selected baud rate. Adress range (1-247 ) is
address of the connected device. The data field contains data sent to the
slave by master or data sent to master by slave.
CRC is a error check method by using MODBUS RTU protocol and consists
of 2 bytes.
MODBUS RTU PROTOCOL
(Available only for EPR-04S)
Standart MODBUS RTU message is shown below.
Serial Communication (Available only for EPR-04S)
EPR-04S has MODBUS RTU communication protocol which is optical
isolated. All measured parameters can be transfer to the computer.
Transformer ratios and communication parameters can be set. Saved
demand and energy values can be reset.
Parameter Settings
Address Parameters : Value can be enter between 001-247.
Baud Rate Parameters : Value can be selected as 2400, 4800, 9600,
19200 and 38400 bps.
Parity Parameters : no, odd and EUEn can be selected.
Bu using UP-DOWN buttons,
find RS-485 menu.
Press SET button (Adr ESS menu is displayed)
Press SET button (001 / 9600 / no is displayed.)
Enter the value of related parameters by scrolling UP/DOWN
buttons (001...247 / 2400...38400 /no, EUEn, odd).
Press SET button, Adr ESS / bAU d / PArýty is displayed. (Data is
entered but is not activated yet. For activating the new data please
follow the below steps).
Press ESC button one by one until SAU E SEt yES is displayed.
Press SET button. When SAU E SEt yES is displayed, if you
press ESC button or choose no option instead of yES option
by using UP-DOWN buttons, new data will be cancelled and
previous value will be activated.
Find the menu which is programmed in Adr ESS / bAU d / PArýty
menus by scrolling UP-DOWN buttons.
Press SET button for 3 seconds (trA Fo menu is displayed)
01 03 00 00 00 02 XX XX
01 Device address
03 Function
00 MSB address
14 LSB address
00 Register number MSB
02 Register number LSB
XX CRC MSB
XX CRC LSB
Read Hold (03) function is used for reading measured values and set value. If
any request of reading of a register, excepted mentioned in register table,
device will send an error message. For example to read phase1 voltage by
sending a message to the device.
Available Modbus Function:
T
ADDRESS
8 BIT
FUNCTION
8 BIT
DATA
NX8BIT
CRCH
CRCL
T
03H
READ HOLD REGISTERS
06H
PRESET SINGLE REGISTER
10H
PRESET MULTIPLE REGISTERS
55H 15
U
U
U
U
U
U
U
U
U
U
U
U
U
U
input 2
input 1
DIN1
DIN2
0
U: undefined
LSB
(Least Significant Byte)
MSB
(Most Significant Byte)
1
