Re: Digest for dragino-user@googlegroups.com - 1 update in 1 topic

[Manuel Alvarez]

Hello,

Did you write the custom decoder for TTN? The decoder by Dragino only parses the battery and a few other things, you have to write your own decoder for the bytes you are sending.

Regards,

Manuel Alvarez
809-697-5120 (WhatsApp)
Misiots, SRL
Calle Roma 2
Ensanche La Julia
Santo Domingo, República Dominicana
malv...@misiots.com
www.misiots.com

On Jun 11, 2026, at 12:45 AM, dragin...@googlegroups.com wrote:

dragin...@googlegroups.com

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• Problems to configure Dragino RS 485 LN Modbus to Lorawan - 1 Update

Problems to configure Dragino RS 485 LN Modbus to Lorawan

Maria Dostert <maria....@velitum.ch>: Jun 08 12:23AM -0700 Hello everyone,   I am using the Dragino RS485-LN (Modbus to LoRaWAN) for the first time. The connection to TTN is working perfectly fine (Join is successful, regular uplinks), but I am not receiving any data from my meter.   The meter is a "CS Instruments VA520" flow meter. Here is what I have configured so far: - Baudrate: 19200 - Parity: EVEN (AT+PARITY=2) - Stop bits: 1 - Modbus Slave ID: 1 (verified)   To query the flow data, I sent the following downlink command on FPort 1: AF 01 01 06 01 03 03 E8 00 02 01 (According to the manual, the flow rate is on Holding Register 1001, so I used 1000 / 03E8).   No matter what I try, the TTN live data always shows: "frm_payload": "Af//////////" (Modbus Timeout) or sometimes just "AQ==" (which decodes to 01, so an empty payload header).   Hardware troubleshooting done so far: - I already tried swapping the RS485 A and B wires, but the timeout remains. - Currently, GND_485 is left unconnected (only A and B are connected).   Do you have any ideas what I might be doing wrong? Am I missing something in the Dragino configuration or could it be an electrical/GND issue?   Thanks in advance for your help!

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