EUCHNER CIS3A-Mini - Manual (Page 7)

EUCHNER Identsystem CIS3A-Mini
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3 Basic telegram structure
Each command and any related data blocks are transferred within the telegram frame in
accordance with procedure 3964R from and to the ident system (figure 1).
With Protocol 3964R, the relevant receiver acknowledges the received telegram by
returning an acknowledgement character (DLE). In the case of negative acknowledgement
(NAK), the entire protocol is repeated. If it is not possible to transfer the protocol error-free
after a total of six attempts, the operation is aborted.
3.1 Basic command structure
Description Byte No. C o n t e n t s
ASCII
Acknowledgemen
of the receiver
+ -
Connection
set-up 3964R procedure start
STX
DLE NAK
Telegram data
max. 128 bytes Number of telegram bytes 0
(telegram core) Command
identification 1
2 T or R
command
Header address 3 01
hex
User data description 4
5
6 Start address
Start address
Number of
data items
User data 7
to n
Connection
cleardown 3964R Procedure end DLE
ETX
BCC
DLE NAK
Figure 1: Basic command structure