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MELSEC-
A
8 OTHER FUNCTIONS
(3) Precautions for using ASCII-BIN conversion transmission/reception
function
(a) The data codes 30H to 39H ("0" to "9") and 41H to 46H ("A" to "F") data is
handled as the transmission/reception data in the conversion target range.
(b) If ASCII-BIN conversion is designated for frame transmission or monitor
transmission, only the transmission data section (contents of transmission
area) is converted into ASCII data.
The registration frame (head frame/end frame when transmitting with
transmission frame 1 area) is not converted into ASCII data.
(c) If ASCII-BIN conversion is designated for the frame reception, only the
reception data section (contents stored in the reception area) is converted
into binary data.
The reception head frame/end frame are compared with the reception data
as the registered data.
(d) If ASCII-BIN conversion is designated for the non-procedural transmission
or monitor transmission function, and the size of the binary data before
conversion exceeds 4096 bytes, the "transmission data size error (BB93
H)"
will occur.
(e) If ASCII-BIN conversion is designated for frame transmission/reception
function, and the byte size of the data including the transmission/reception
data after ASCII-BIN conversion, the head frame and end frame exceeds
4096 bytes, the following errors will occur.
•
When transmitting: Transmission data size error (BB93H)
•
When receiving: Reception data size over error (BBA2H)
(4) Setting the buffer memory
When carrying out ASCII-BIN conversion, designate the R2 buffer memory
shown below.
R2 buffer
memory
address
Name Details
R2
103H
ASCII-BIN
conversion
designation
Designate whether to carry out ASCII-BIN conversion to
transmit/receive data as ASCII codes when exchanging data with
the external device.
0 : Do not carry out ASCII-BIN conversion. (Default value)
1 : Carry out ASCII-BIN conversion.
POINT
When the above buffer memory setting values have been changed, initialize the R2
with the process given in section 8.6.