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7-1SectionOverview
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7-1 Overview
If two PCs are linked one-to-one by connecting them together through RS-232C
or 4-wire RS-422A/485 cable, they can share up to 64 words of their LR areas.
The 1:1 Data Links are the same as normal Data Links in that data is not shared
bidirectionally, i.e., the link words written by one PC are transferred to the other
PC.
One of the following three ranges of words can be set to be linked:
LR 00 to LR 63, LR 00 to LR 31, or LR 00 to LR 15
A 1:1 Data Link communications system can be created between the CQM1H
and another CQM1H, or between the CQM1H and the CQM1, C200HX/HG/HE,
C200HS, CPM1, CPM1A, CPM2A, CPM2C, or SRM1(-V2).
One of the PCs is set as a 1:1 Data Link master and the other as a 1:1 Data Link
slave. The linked words are separated into two groups of words, and the words
written by each PC is transferred to the other PC, as illustrated in the following
diagram.
For example, if LR 00 to LR 63 are linked, the status of LR 00 to LR 31 written by
the master CQM1H will be transferred to LR 00 to LR 31 of the slave CQM1H,
and the status of LR 32 to LR 63 written by the slave CQM1H will be transferred
to LR 32 to LR 63 of the master CQM1H.
LR 00
LR 31
LR 32
LR 63
Master area
(sent)
LR 00
LR 31
LR 32
LR 63
Master area
(received)
RS-232C
Slave area
(received)
Slave area
(sent)
to
to
to
to
CQM1H or
other C-series PC
CQM1H or other C-series PC
Link
Serial Communications Board
CQM1H or
other C-series PC
CQM1H or
other C-series PC
The words in the LR area that will be linked are set in the PC Setup as shown in
the following table.
PC Setup Setting
Port 1 Port 2 Bits Function Setting Master words Slave words
DM 6555 DM 6550 04 to 07 Link words for 1:1 link
0 Hex: LR 00 to LR 63 LR 00 to LR 31 LR 32 to LR 63
1 Hex: LR 00 to LR 31 LR 00 to LR 15 LR 16 to LR 31
2 Hex: LR 00 to LR 15 LR 00 to LR 07 LR 08 to LR 15
7-1-1 Starting Data Links
Connect two PCs one-to-one through RS-232C or 4-wire RS-422A/485 cable,
make the proper settings in the PC Setup, and turn ON the power supplies. The
1:1 Data Link will start automatically.