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C1: Control word 1
The following three items are set for SCU.
・ Communications port No. (internal logical port): #0 to #7
・ Serial port No. (physical port): #1 or #2 (#1: PORT1, #2: PORT2)
・ Unit address of Destination Device: # unit number + #10
Control word: C1
Communications port No.
(Internal logical port)
C2: Control word 2
The communications sequence number is set, which is registered as protocol data.
For information on the communications sequence number registered in this protocol data,
refer to 9.2.1 Communications Sequence Number.
Control word: C2
[S: First send word (send area specification)]
The first word of the words required to send data is specified. S contains the number of
words (n) to be sent. (i.e., including the S word)
Between #0000 and #00FA (n=&0 and &250) words can be send.
The send data (variable data) is entered in the words from S+1 to S+(n-1).
If there is no operand specified in the execution sequence, such as a direct or linked word,
set constant #0000 for S.
+0 word
Bit
15
*
*
*
Send area: S
[R: First Receive Word (receive area specification)]
The number of receive words (m) is automatically stored in R (i.e., including the R word).
The received data is stored in the words from R+1 to R+(m-1). (m=&0 to &250 or #0000 to
#00FA)
+0 word
Bit
15
*
*
Receive area: R
+0 word
Bits
15
*
*
+0 word
Bits
15
*
*
*
+1 word
+2 words
15
15
0
0
*
*
*
*
*
*
*
No. of send area words
+1 word
0
15
0
15
*
*
*
*
*
*
No. of receive area words
0
*
*
Unit address of Destination Device
Serial port No. (physical port)
0
*
Communications sequence No.
&0 to 999 (#0000 to 03E7)
+3 words
15
15
0
0
*
*
*
*
*
*
*
Data
+2 words
+3 words
0
15
*
*
*
*
*
*
*
Data
9．Program
...words
(n-1) words
15
0
0
*
*
*
*
*
*
*
...words
(m-1) word
0
15
0
15
*
*
*
*
*
*
*
49
0
*
*
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