Specifications

43
Message Request of Data Section 5-7
Terminal
active partner passive partner
STX
.
,
DLE (NAK)
Data
.
DLE
.
ETX
.
BCC (selectable)
.
,
DLE (NAK)
Please note:
If the character 10
16
is to be transmitted but not to be evaluated as a DLE, the
transmitting device will add another 10
16
.
If the receiving device detects a 10
16
(DLE) twice, it will accept 10
16
only once and
will not evaluate it as a DLE control character.
5.6.1 Block Check BCC
With the block check method (3964R), a block check character is created and
added to the end of the block.
The BCC is formed through a logic XOR of all characters with the exception of the
start character STX (02
16
).
5.6.2 Logical Part of the Procedure 3964, RK512
A logical part, which complies with the Siemens protocol RK512 to a great extent,
has priority over the physical part of the procedure.
This part governs the type and contents of the data part.
5.7 Message Request of Data
Terminal
active partner
request
.
passive partner
STX
.
,
DLE
Message header
.
DLE
.
ETX
.
BCC (selectable)
.
,
DLE
,
STX
DLE
.
,
Message response
,
Data
,
DLE
,
ETX
,
BCC
DLE
.