300
The
following diagram shows the format for host link command (TXD) sent from
the C200HS. The C200HS automatically attaches the prefixes and suffixes,
such as the node number, header, and FCS.
@ X X X X X X ......... X X X ∗ CR
Header
code (EX)
Data (122 ASCII characters max.)
FCS
Node
number
Terminator
RS-232C Mode N
must be BCD from #0000 to #0256. The value of the control word
determines
the
port from which data will be output
and the order in which data will be written
to memory.
Control Word The
value of the control word determines the port from which data will be read
and the order in which data will be written to memory.
Byte
order
0: Most significant bytes first
1: Least significant bytes first
Not used. (Set to 00.)
Port
0: Specifies RS-232C port
(C200HS-CPU21-E/23-E/31-E/CPU33-E).
1: Specifies peripheral port.
Digit number:
3210
The
specified number of bytes will be read from S through S+(NP2)–1 and
trans
-
mitted through the specified port.
MSB LSB
S12
S+1 3 4
S+2 5 6
S+3 7 8
When
digit 0 of C is 0, the bytes of source data shown above will be transmitted in
this order: 12345678...
When
digit 0 of C is 1, the bytes of source data shown above will be transmitted in
this order: 21436587...
Note When
start and end codes are specified the total data length should be 256 bytes
max., including the start and end codes.
Flags ER: Another device is not connected to the peripheral port.
There
is an error in the communications settings
(PC Setup) or the oper
-
and settings.
Indirectly
addressed DM word
is non-existent. (Content of *DM word is
not BCD, or the DM area boundary has been exceeded.)
The source words (S to S+(N÷2)–1) exceed the data area.
26405: RS-232C Port Communications Enabled Flag
26413: Peripheral Port Communications Enabled Flag
26705: Host Link Unit #0 Communications Enabled Flag
26713: Host Link Unit #1 Communications Enabled Flag
Serial Communications Instructions Section 5-27
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