Vega NB-13 / User Manual
23
Revision 06 of 24 January 2022
TRANSPARENT MODE
In transparent mode, the modem opens and maintains a session with the server. During
the session, the packets received from the server are transmitted by the modem to the device,
the packets from the device are transmitted to the server. The device can be connected via
RS485, RS232 interfaces. The exchange packets have a specific format.
1.
Data transmitting format for transparent mode for server-to-device and device-to-
server packets.
Offset
Size, byte
Description
Range of values
0
1
Transparent packet ID (0x05)
-
1
1
Packet type
-
2
2
Packet size (little-endian)
1…1024
4
1-1024
Transmitting data
-
Types of packets for transparent channel
Packet type Description
0x02
Server-to-device packet
0x03
Device-to-server packet. Send data from the port RS485/RS232. S
0x0B
Identity packet includes IMEI and ICCID. Modem sends this packet to the
server when communication session is open.
0x04
Server-to-device packet with packet ID and device response timeout
0x05
Device-to-server packet with packet ID
1)
Example of identification packet:
050B1000C4AC018330150300CF297C4E0DD2720C
Transparent
packet ID
Packet
type
Data size
Modem IMEI
ICCID of SIM
0x05
0x0B
0x0010
0x000315308301ACC4 0x0C72D20D4E7C29CF
Device IMEI and ICCID in this packet are represented as hexadecimal unsigned long (64
bit) in byte format little-endian. For example, IMEI 0x000315308301ACC4 = 867723030670532
Dec.
2)
Example of server-to-device packet:
05020800010300010001D5CA
Transparent
packet ID
Packet
type
Data size
Data sent to the port RS485/RS232
0x05
0x02
0x0008
0x010300010001D5CA
3)
Example of device-to-server packet
050307000103024567CB3E