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8. COMMUNICATIONS USING DEDICATED PROTOCOLS
Example 1 :
To start transmission of data, stored in buffer memory at addresses 120H and 121H, by
the sequence program. (AlSJ71C24
I10
addresses are CO to DF,transmission data is
designated in word units.)
Computer
AlSJ71C24 appends PC number " F E automatically
A1 SCPU
processing
Buffer
memory
1 0 3 ~ 1 7 1
1
logHH
OAH
I
"1" i s written if a
transmission error
occurs.
Data is transmitted
sequentially in units of 4
bits from the higher bit.
0
Request to turn OFF
error indicator LED
Sets word unit for data transmission
20
Converts the start signal to PLS
25
Sets transmission data
transmission data storage
area
and
data length
TOP lHOOOC H0109
1
0 2
1
K2
76
I
PLF
I
M I
80
v i
FROM
t
=
l K 1
I D 4 1
I
SET
I
YO21
Resets the on-demand error
(Start is disabled if the content at
address I O C H is "I,'.)
(2) Starts the on-demand function
Transmission completed flag
Reads the transmission error storage
area to check transmission status
:IRCUIT END
0 : Correct transmission
(address l o c H
{I
:
Data not lransmitted
due to an error
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