Protocol description ASCII, SECS/HSMS
Customer manual
Version 1.2
LFM LP Reader 15.01.2019
Page 37 of 119
HERMOS AG
Gartenstrasse 19 Tel. +49(9279) 991-0
D-95490 Mistelgau Fax. +49(9279) 991-100
Packet header
The packet header contains a start character and the message length. The message length consists of 2
hexadecimal bytes and defines the number of characters in a message.
Start Start character (ASCII character "S")
Length 1 High byte of the message length (ASCII character "0"-"F")
Length 2 Low byte of the message length (ASCII character "0"-"F")
Advanced ASCII-format:
The advanced ASCII format is defined for ASCII messages whose message length exceeds 255
characters. The packet header contains two start characters and the message length. The message length
consists of 4 hexadecimal bytes and defines the number of characters in a message.
Start 1 First start character (ASCII character "S")
Start 2 Second start character (ASCII character "X" = advanced ASCII protocol)
Length 1 High byte of the message length (ASCII character "0"-"F")
Length 2 Byte packet length (ASCII character "0"-"F")
Length 3 Byte packet length (ASCII character "0"-"F")
Length 4 Low byte of the message length (ASCII character "0"-"F")
Message data
The message contains a command character, a target or source address, the number of the antenna port
(head) and the actual message data.
The number of the antenna port is not required for all messages.
Command The command is defined by an ASCII character.
(See protocol commands)
Address Target/source address (ASCII characters "0", "1", …) *
Data The definition of the message data depends on the protocol command.
* Depending on customer parameters, the readers are addressed via the address "0 ... E"
( Parameter E).
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