Mitsubishi Electric AJ71C24-S6 User Manual page 114

7 .
INITIAL SETTING OF TRANSMISSION CONTROL DATA TO
BUFFER MEMORY
M C l C C P - A
7.4.4
Setting a buffer memory area for no-protocol send
This section describes how t o set the AJ71C24 buffer memory area to store
data transmitted from the PC CPU to an external device in the no-protocol
(
mode and gives an example.
When the bidirectional mode setting area (address 112H) is set to "I", this
memory area is set for bidirectional mode transmission.
Setting method
7
Write the head address in hexadecimal
i
104H (Head address setting)
(Default
:
OH)
105H (Buffer size setting)
(Default : 80H)
Write the memory size (number of
addresses) in hexadecimal.
(1) Buffer memory addresses 100H to 11FH are for the special applica
tions area and should not be set.
r
(2) When other kinds of devices are also used, make sure that t h ~
specified range does not overlap the no-protocol receive area or t h ~
on-demand data area.
(3)
Buffer memory address 105H should include the storage area of thl
no-protocol send data length.
I
(4) If any range except the user area is set, the AJ71C24 will execut~
operations with defaults including the areas mentioned in (2) above.
Example1
To set the head address to 120H and the memory size to 100H (AJ71C24 I10 addresses
to 9F.
Sequence Program
Write HI20 to buffer memory address t04H.
I
Write HtOO to buffer memory address 105H.
Address Buffer memory
Shows that the head address is 120H
Shows that the memory size is 100H.
Buffer memory area for
the
nO.plOb~01
send
Area for no-protocol send (100H addresses)