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ML-x17 DATA LOGGER MANUAL
Manufacturers of low power instruments
page 53
4.19 Serial Port
The serial port of your data logger provides different forms of serial communications. This chapter
describes the details of this communication.
4.19.1 RS232
This mode allows to connect to RS232 sensors, see
RS232
for details of the electrical properties.
Below a menu-settings screen is shown, for an RS232 sensor.
4.19.2 Generic Modbus
This is a versatile protocol that can be used with RS232, but you’ll encounter it more frequent with
RS485. Below the settings menu for Modbus is shown:
4.19.2.1
Port Settings
The user can select the right baud rate and Modbus Address of his sensor here. The address of the
sensor is very often adjustable, with the aid of a configuration tool of the sensor’s manufacturer. So, the
user can change this according to its need. You can build a multi-sensor network, by using unique
addresses.
4.19.2.2
Protocol type
Choose the MODBUS protocol type: RTU or ASCII
RS232 sensors
[0] Exit
[1] Generic
MODBUS/RTU
[2] Generic Serial
[3] Generic NMEA
>
MODBUS sensor
[0] Exit
[1] Name >> MODBUS
[2] Port settings >> RS485 8N1; 19200 Baud; Address 1
[3] Sensor power >> Disabled
[4] Sample interval >> Data log interval
[5] Protocol type >> RTU
[6] Measurement commands >> Not used
[7] Register type >> Holding
[8] Data type >> WORD (unsigned 2 bytes)
[9] Data start register >> 62592 (462593)
[A] Parameter 1 >> Water temperature
[B] Parameter 2 >> Conductivity
[C] Parameter 3 >> Not used
[D] Parameter 4 >> Not used
[E] Parameter 5 >> Not used
[F] Parameter 6 >> Not used
[G] Parameter 7 >> Not used
[H] Parameter 8 >> Not used
[I] Parameter 9 >> Not used
[M] More parameters >> Not used
[R] Remove
[T] Test measurement
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