USER MANUAL: MODBUS / RS-485 NANO FIRE DETECTION & EXTINGUISHING CONTROL PANEL www.N2KB.nl |November 1, 2022 | version 1.
Table of contents 1 2 3 4 5 6 7 8 DOCUMENT REVISION DETAILS IMPORTANT NOTES – READ CAREFULLY INTRODUCTION CONNECTING THE DATA BUS CONNECTION SETTING CHOOSE A MODBUS ADDRESS 2 2 3 3 3 4 6.1 6.2 6.3 6.4 6.
INTRODUCTION The NANO is designed to be used in a fully integrated system. Remote devices can read the status and parameters of the NANO by a digital bus system. The technology used is MODBUS. This is a very wellestablished bus technology that uses RS-485 as the underlaying physical layer. Please read the NANO User Manual before using the device. This manual only manages the data bus usage. 4 CONNECTING THE DATA BUS RS-485 is a 3-wire bus.
6 CHOOSE A MODBUS ADDRESS It is possible to connect multiple devices to one data bus. It is very important to give each device in the data bus a unique address. This is done via the buttons on the NANO panel front. 6.1 STEP 1 MODBUS SETTINGS Set the NANO in programming mode by pressing and holding the MODE and the MUTE button simultaneously for more than 3 seconds. 6.2 STEP 2 INDICATION On the front of the NANO, the green power indicator will flash rapidly.
7 MODBUS REGISTER All parameters are read only holding registers and can be read by an external MODBUS RTU master device via “Read hold register” commands. It is possible to read multiple registers with one command by changing the requested data length. All register contains 16 bits data. If data is requested beyond the last available register the data is cut-off at the end and the reply will have the corrected data length.
Register Name Description length 40088 Event count: fault external hold open Nr. Of events occurred since reboot 1 40089 Event count: fault external hold shorted Nr. Of events occurred since reboot 1 40090 Event count: fault external hold midrange Nr. Of events occurred since reboot 1 40091 Event count: fault external release open Nr. Of events occurred since reboot 1 40092 Event count: fault external release shorted Nr.
Register Name 40164 Button state: Extinguish Description 0 = not pushed, 1 = pushed, 2 = pushed long, 3 = pushed longer length 1 40170 Button pushed count: Reset Nr. Of events occurred since reboot 1 40171 Button pushed count: Hold Nr. Of events occurred since reboot 1 40172 Button pushed count: Mode Nr. Of events occurred since reboot 1 40173 Button pushed count: Mute Nr. Of events occurred since reboot 1 40174 Button pushed count: Extinguish Nr.
NOTES Modbus user manual | NANO-NL | November 1, 2022 | version 1.
