975
Serial Communications Instructions Section 3-24
specified, the data in the word or register must always be 0000. An error will
occur and the Error Flag will turn ON if any other constant or a word address
is given and PMCR(260) will not be executed.
R: First Receive Word and Receive Area
Received data is automatically stored in words starting with R+1 and the num-
ber of words received plus R (i.e., including R) is automatically written to R
between 0000 and 00FA hex (0 and 250 decimal).
Setting Before Executing PMCR
Set the data specified by m (beginning with D) as the initial data for the
receive buffer (backup data for receive failure). Data m can be set to 0002 to
00FA (hex) (2 to 255). If 0000 (hex) or 0001 (hex) is specified for m, the initial
value of the receive buffer will be cleared to 0.
Always set a word address for R even if there is no receive data. If a constant
is set, an error will occur, the Error Flag will turn ON, and PMCR(260) will not
be executed. If there is no receive data, R will not be used and can be used for
other purposes.
If there is no operand specified in the execution sequence, such as a direct or
linked word, specify the constant #0000 for R. If a word address or register is
specified, the data in the word or register must always be 0000.
Operand Specifications
to
Number of send words + 1
n words of data must be
prepared in advance.
R
to
The m words of data that is
received is stored here.
Number of received words +1
Area C1 C2 S R
CIO Area CIO 0000 to CIO 6143
Work Area W000 to W511
Holding Bit Area H000 to H511
Auxiliary Bit Area A000 to A447
A448 to A959
A448 to
A959
Timer Area T0000 to T4095
Counter Area C0000 to C4095
DM Area D00000 to D32767
EM Area without bank E00000 to E32767
EM Area with bank En_00000 to En_32767
(n = 0 to C)
Indirect DM/EM
addresses in binary
@ D00000 to @ D32767
@ E00000 to @ E32767
@ En_00000 to @ En_32767
(n = 0 to C)
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