Omron C200H-ASC11, Руководство пользователя, Страница: 272 / 301

263
Appendix B
Comparison with C200H-ASC02
The following table provides details of the differences between the C200H-ASC11/ASC21/ASC31 and the
C200H-ASC02 ASCII Units. For an overview of the comparison, see
1-5 Comparison with Previous ASCII
Units .
Item C200H-ASC02 C200H-ASC11/21/31
Executing programs Executes the source
program as it has been input
as soon as RUN is executed. Generates intermediate
code for the source program
before executing it, so there
is a short delay between
when RUN is executed and
the program is executed.
Memory Allocation in the character
variable area Dynamic method. The user can select between
a static (fixed) method and a
dynamic (free) method,
depending on whether the
OPTION LENGTH command
is used.
Defragmentation
(reorganization of unused
areas) Executed while program is
executing. Executed when the RUN
command is executed.
Setting memory areas Memory areas specified
using the FRE command. None
Communications Communications buffers Receive buffer: 256 bytes
Transmit buffer: 256 bytes
Receive buffer: 512 bytes
Transmit buffer: 512 bytes
ER (DTR) code Controlled by the system. Also can be controlled by the
DTR command in the
program instead of the
system.
Indicator showing that data
is waiting to transmit. The ERR indicator is lit. BASIC indicator flashes
slowly.
Limiting the output code
when executing the PRINT
command, depending on the
device code specifications
for the OPEN command. Depending on the code,
some codes are not output,
and some are output with LF
added. The TERM command cannot
be used for communications
port #2. Otherwise, there is
no limitation on outputs.
DMA (Direct Memory
Access) data transmission
when sending data with the
PRINT command. Not available. (DMA
transmission is not available.
Depending on the software,
send data and stop the
BASIC program execution.) Available. (DMA
transmission can be enabled
or disabled. While software
data transmission is being
performed, parallel hardware
data transmission is possible
by using a trigger from the
software.
Exchanging data with the
CPU Unit Number of data words that
can be exchanged using PC
READ/PC WRITE (including
@) in one cycle of the CPU
Unit 20 words max. 20 words or 127 words max.
(available for C200HX/HG/
HE or CS1-series PCs only)
Amount of data that can be
exchanged using I/O
allocation. CPU-to-ASCII Unit: 8 bits
ASCII-to-CPU Unit: 8 bits
CPU-to-ASCII Unit: 32 bits
ASCII-to-CPU Unit: 16 bits
Monitoring errors generated
in the ASCII Unit from the
CPU Unit. Not available Available
Storing data in character-
string variables for such
commands as PC READ and
PC WRITE. Only the first 4 characters
are read or written for each
character variable. Up to 255 characters can be
read or written for each
character variable.