Communication Protocol; Vega Si-13 Modem Transmits The Following Types Of Packets; Packet With Current Readings; Data Packet From An External Device, Received Via Rs-232 Or Rs-485 Interface - Vega Absolute SI-13 User Manual

4 COMMUNICATION PROTOCOL

This part describes the SI-13 data exchange protocol with LoRaWAN
uses the LoRaWAN port 2 for uplink and downlink messages.
In fields consisting of several bytes, the little-endian byte order is used

VEGA SI-13 MODEM TRANSMITS THE FOLLOWING TYPES OF PACKETS

1. Packet with current readings

Sent regularly on LoRaWAN port 2
Size in bytes Field description
1 byte Packet type, 00 – current packet, alarm packet 01-04
by the logic of RS485/232, FC – by the guard input 1,
FD – by the guard input 2
4 bytes Packet time (unixtime)
1 byte Temperature, °С
4 bytes Input 1 reading (depending on the type – number of
pulses or status: 0 – open, 1 - closed)
4 bytes Input 2 reading (depending on the type – number of
pulses or status: 0 – open, 1 - closed)
4 bytes Reserve

2. Data packet from an external device, received via RS-232 or RS-485 interface

Size in bytes Field description
1 byte Packet type, this packet = 3
2 bytes Total data size received via interface
1 byte Data size in this packet
1 byte Sequential number of the setting in the configurator
(counting starts from 0)
1 byte Total number of the packets
Array Data [1-40 bytes]
The LoRa data transfer technology limits the maximum packet size, depending on the
speed of packet transmission. If the data received through the external interface cannot be
transmitted in one packet, they are split into several packets, which are transmitted
sequentially.

3. Packet with time correction request

Sent every seven days on LoRaWAN port 4
16
Vega SI-13 / User Manual
® network. SI-13
Data type
uint8
-
int8
uint32
uint32
-
Data type
uint8
uint16
uint8
uint8
uint8
-
Revision № 14 of 06 August 2021