ML-417 option boards
Option boards can be used to add additional inputs/features to an ML-417 data logger or to perform signal conditioning.
You can mechanically stack up to 3 option boards, but only one board per category ID (CID).
Some boards are having a switch to choose a different CID, so you can stack multiple similar boards.
Converter(OC) or Power (OP) boards don't have CID's and you can stack as many OC/OP-boards as mechanical feasible.
OC-boards don't make use of the internal control bus, but are wired to existing inputs/outputs/ports.
| Cat. | CID | SKU, Description | Ranges | Excitation | Terminals |
| AD | 0x48 & 0x49 |
ML-OI-AD-80MV, Dual channel 16-bit differential input
a/o to connect pyranometers or load-cells | ±80mV ±40mV ±20mV ±10mV | 5V @80mA |
1. In 1 (+) 2. In 1 (-) 3. In 2 (+) 4. In 2 (-) 5. Excitation 6. Ground 7. CID selector |
ML-OI-AD-2000MV, Dual channel 16-bit differential input
a/o to connect thermistors or pH-probes |
±2000mV ±1000mV ±500mV ±250mV | 5V @80mA |
1. In 1 (+) 2. In 1 (-) 3. In 2 (+) 4. In 2 (-) 5. Excitation 6. Ground 7. CID selector | ||
ML-OI-AD-10V, Quad channel 16-bit single ended input
| ±10V ±5V ±2.5V ±1.25V | 12V |
1. Input 1 2. Input 2 3. Input 3 4. Input 4 5. Excitation 6. Ground 7. CID selector | ||
ML-OI-AD-20MA, Quad channel 16-bit single ended input
| ±20mA | 12V |
1. Input 1 2. Input 2 3. Input 3 4. Input 4 5. Excitation 6. Ground 7. CID selector | ||
ML-OI-AD-PT1000, Dual channel 2 or 3-wire PT1000 input
| -40…+85°C (±1.5°C) -20…+40°C (±1°C) On user calibration: -40…+85°C (±0.5°C) |
1. In 1(+) 2. In 1(-) 3. In 1(-) 4. In 2(+) 5. In 2(-) 6. In 2(-) 7. Wire selector 8. CID selector | |||
| AX | 0x46 & 0x47 |
ML-OI-AX-DI, to add four more digital inputs |
0/1 0…16777216 5V 500Hz |
1. Input 1 2. Input 2 3. Input 3 4. Input 4 5. Ground 6. Backup batt. 7. CID selector | |
ML-OI-AX-DS18B20, to connect up to four 1-Wire digital thermometers
Supported chips: DS1820, DS18B20, DS18S20, DS1822, DS1920 | 3.6V |
1. Input 1 2. Input 2 3. Input 3 4. Input 4 5. Excitation 6. Ground 7. CID selector | |||
ML-OI-AX-HART, Octo channel HART input
Supports multi-drop topology to connect multiple sensors devided over max 8 input channels. | 12V |
1. Loop (+) 2. Loop (-) 3. Excitation 4. CID selector | |||
ML-OI-AX-RH, to connect an external I2C based humidity sensor
Supported chips: AM2315 (AOSONG) ChipCap2 (Amphenol/Telaire T9602-D-3) SHT3x (Sensirion) | 3.6V |
1. SCL 2. SDA 3. Excitation 4. Ground 5. CID selector |
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| BARO | 0x76 | ML-OI-BARO, Atmospheric pressure & temperature sensor a/o to compensate readings of level sensors  |
300…1200hPa (±2hPa) -30…+70°C (±1°C) | ||
| COM | 0x4C | ML-OI-COM-UART, Serial sensor input (UART)
to connect sensors with TTL UART port | 300…230k4bps Tx (0…3.3V) Rx (0…5V) | 3.3V |
1. Excitation 2. Transmit 3. Receive 4. Ground |
ML-OI-COM-RS232, Serial sensor input (RS232)
a/o to connect an NMEA-0183 transponder | 300…230k4bps | 12V |
1. Excitation 2. Transmit 3. Receive 4. Ground | ||
ML-OI-COM-RS485, Serial sensor input (RS485)
a/o to connect a MODBUS/RTU sensor | 300…230k4bps | 12V |
1. Excitation 2. RS485 A+ 3. RS485 B- 4. Ground | ||
ML-OI-COM-SDI12, SDI-12 sensor input
| 12V |
1. Excitation 2. Ground 3. Data | |||
| OA | 0x4D | ML-OA-RS232, RS232 Auxiliary board To add a secondary accessory to an ML-417ADS (e.g. to add a second camera) |
Off/On: 0/3.6V 300…230k4bps |
1. Control out 2. Transmit 3. Receive 4. Ground | |
ML-OA-WIFI, WiFi Auxiliary board
To transfer log files by WiFi (TCP, MQTT & HTTP) |
<400m +19dBm transmit power -96dBm sensitivity IEEE 802.11b/n/g |
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| OO | 0x50 & 0x51 |
ML-OO-MODBUS, MODBUS/RTU auxiliary output board
 To share sensor readings with your local SCADA system |
32 floating-point values 4800…38k4bps |
1. RS485 A+ 2. RS485 B- 3. Ground 4. CID selector | |
ML-OO-SW, digital output board
 To add three galvanic isolated switches with potential free contacts |
±100V ±200mA |
1. Contact 1a 2. Contact 1b 3. Contact 2a 4. Contact 2b 5. Contact 3a 6. Contact 3b 7. CID selector | |||
| OC | n/a | ML-OC-W2P, Waveform to digital pulse converter
To connect flow meters or anemometer with a passive coil output |
0…50kHz 60mV…24V Pulse 0/3.6V |
1. Coil in (+) 2. Coil in (-) 3. Pulse out | |
| OP | n/a | ML-OP-524, to power external sensors or peripherals
Power switches on in parallel with logger sensor power switch (internal control) or from an external signal. |
5V@300mA, 12V@200mA or 24V@100mA Off/On: 0/3…24V 3.6V (from batteries) |
1&2. Output 3&4. Ground 5. Control in 6. Supply 7. Volt selector 8. Cntrl mode |
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| OU | 0x4A | ML-OU-BLE, Bluetooth LE user interface
To enable wireless local access |
<160m +4dBm transmit power -92dBm sensitivity |
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