User`s manual

226
1) Q series C24 processing corresponding to register codes FFH and 00H
The following uses an example to describe the processing performed by the Q series C24 when it receives a
user frame part corresponding to register codes FFH and 00H.
Assume that a user frame containing the data codes 02H, FFH, 00H, and 3BH was set as receive user frame
No. 3EAH.
• When the Q series C24 receives the 3 bytes of data "STX, arbitrary data (1 byte), ; ", it processes them as
if user frame No. 3EAH was received.
• The Q series C24 does not check the 2 bytes described above.
2) Transmission/reception data corresponding to register codes FFH and 01H
The Q series C24 transmits and receives the user frame part corresponding to register codes FFH and 01H by
representing the station No. set in the GX Developer switch setting as 1-byte binary data.
See the first frame part shown in the illustration in item 3 for an example.
3) Transmission/reception data corresponding to register codes FFH + 04H, FFH + 05H, FFH + 0AH, and FFH
+ 0BH.
• For FFH + 04H and FFH + 0AH: The horizontal parity code that calculates the range for the
transmission/reception data (message) is expressed as 1 byte of binary data and then transmitted and
received. The difference between FFH + 04H and FFH + 0AH is the difference in the calculation range.
• For FFH + 05H and FFH + 0BH: The horizontal parity code that calculates the range for the
transmission/reception data (message) is expressed as 2-byte ASCII code data and then transmitted and
received from the upper digit. The difference between FFH + 05H and FFH + 0BH is the difference in the
calculation range.
Examples of the transmission and reception data arrangement of the horizontal parity codes are shown below.
(One first frame and one last frame each)
For register code FFH + 04H
1
31H
:AB
02H 3BH 42H41H
S
T
X
Check
Receive data
If the 02H and 3BH data parts match, they are processed as if
user frame No. 3EAH mentioned above was received
Receive data
code
02H 00H 3BH
02H FFH+01H
;
3BH
12
03H 0DH
03H FFH+04H 0DH 0AH
07H 0AH
34
31H
E
T
X
S
T
X
C
R
L
F
32H 33H 34H
Station
No.
User frame
(last frame)
Horizontal
parity
code
Arbitrary data
Calculation
range
User frame
(first frame)
User frame
register code
Transmission/
reception data
code