QUICK GUIDE
MOP301 – Moisture in Oil Probe with Modbus RTU
Find this document and further product information on our website at www.epluse.com/mop301.
Electrical Connection
Important note:
The manufacturer cannot be held responsible for personal injuries or damage to property as a result of incorrect handling, installation, wiring, power supply and maintenance of the device.
M12 device plug front view
| Pin number | Function |
| 1 | Supply voltage 24 V DC class III  (Europe) / class 2 (North America) |
| 2 | RS485 B (D-) |
| 3 | GND |
| 4 | RS485 A (D+) |
Modbus Setup
| Factory settings | Selectable values | |
| Baudrate | 9 600 | 9 600, 19 200, 38 400, 57 600, 115 200 |
| Data bits | 8 | 8 |
| Parity | Even | None, even, odd |
| Stop bits | 1 | 1, 2 |
| Modbus address | 70 | 1…247 |
The recommended settings for multiple devices in a Modbus RTU network are 9600, 8, Even, 1. The MOP301 represents 1 unit load in a Modbus network.
Device address, baud rate, parity and stop bits can be set via:
- PCS10, Product Configuration Software and the appropriate configuration cable HA011018. The PCS10 can be downloaded free of charge from www.epluse.com/pcs10.
- Modbus protocol in the register 60001 (0x00) and 60002 (0x01).
See Application Note Modbus AN0103 (available at www.epluse.com/mop301).
The serial number in ASCII format is located at read register address 30001-30008 (16 bits per address). The firmware version is located at register address 30009 (bit 15…8 = major release; bit 7…0 = minor release). The sensor name is located at register address 30010.
| Communication settings (INTEGER 16 bit) | ||
| Parameter | Register number 1) [DEC] | Protocol Address 2) [HEX] |
| Write register: function code 0x06 | ||
| Modbus address (Slave ID) | 1 | 0x00 |
| Modbus protocol settings 3) | 2 | 0x01 |
| Device information (INTEGER 16 bit) | ||
| Parameter | Register number 1) [DEC] | Protocol Address 2) [HEX] |
| Read register: function code 0x03 / 0x04 | ||
| Serial number (as ASCII) | 1 | 0x00 |
| Firmware version | 9 | 0x08 |
| Sensor Name | 10 | 0x09 |
- Register number starts from 1.
- Protocol address starts from 0.
- For Modbus protocol settings see Application Note Modbus AN0103 (available on www.epluse.com/mop301).
Modbus Register Map
| FLOAT 32 bit: | |||
| Parameter | Unit | Register number 1) [Dec] | Register address 2) [HEX] |
| Read register: function code 0x03 / 0x04 | |||
| Water activity aw | – | 1135 | 0x46E |
| Water content x | ppm | 1141 | 0x474 |
| Temperature T | °C | 1003 | 0x3EA |
| °F | 1005 | 0x3EC | |
| Oil parameter A | – | 224 | 0xDF |
| Oil parameter B | – | 226 | 0xE1 |
| Write register: function code 0x10 | |||
| Oil parameter A 3) | – | 101 | 0x64 |
| Oil parameter B 3) | – | 103 | 0x66 |
- Register number starts from 1
- Register address starts from 0
- Examples: Writing Parameter A -2663.30005 decimal: E7 10 00 64 00 02 04 74 CD C5 26 E5 BA
Writing Parameters A and B -1663.30005 and 7.3705 decimal: E7 10 00 64 00 04 08 E9 9A C4 CF DB 23 40 EB AB 61
If two parameters are to be uploaded, it is recommended to write them with a single command.
Installation
Please note:
Continuous oil flow allows for short response time. In such installations, place the sensor with the perforated filter at least partially within the oil.
Mounting example with a ball valve (not included in the scope of supply).
For further mounting options, please refer to the user manual on our website: www.epluse.com/mop301
INFORMATION
E+E Elektronik Ges.m.b.H.
Langwiesen 7 • 4209 Engerwitzdorf • Austria
Tel: +43 7235 605-0 • Fax: +43 7235 605-8
info@epluse.com • www.epluse.com
LG Linz Fn 165761 t • VAT No. ATU44043101
Place of Jurisdiction: 4020 Linz • DVR0962759
+43 7235 605 0 / info@epluse.com
QG_MOP301 // v1.0 // Modification rights reserved // 195060
Documents / Resources
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E E ELEKTRONIK MOP301 Moisture in Oil Probe with Modbus RTU [pdf] User Guide MOP301 Moisture in Oil Probe with Modbus RTU, MOP301, Moisture in Oil Probe with Modbus RTU, Moisture in Oil Probe, Oil Probe, Probe |
