Omron CPM1 Programming Manual page 211

One-to-one PC Link between two CPM2A PCs
RS-232C port
LR00
Write
LR07
LR08
Read
LR15
CPM2A/CPM2C 1:1 PC
Link
Application Procedure
Setting communications.
Connecting the cables
Communications Switch
Setting
CPM2A CPU Unit
Master
Link bits
Write
area
Read
area
The link relay area on CPM2A/CPM2C PCs is only 16 words, LR00 to LR15.
When performing a 1:1 PC Link with a CPM2A/CPM2C PC and a CQM1,
C200HS, or C200HX/HE/HG use the corresponding 16 words, LR00 to LR15 on
the CQM1, C200HS, or C200HX/HE/HG PC. A 1:1 PC Link with a CPM2A/
CPM2C PC cannot be formed using LR16 to LR 63.
Use the settings in the PC Setup (DM6645 to DM 6649) for
RS-232C communications.
(Turn OFF the Communications switch on the CPM2A's CPU
Unit or pin 1 of the DIP Switch on the CPM2C's CPU Unit.)
Connect a 1:1 PC Link with another PC.
The CPM2A's communications are controlled by the communications switch on
the front of the CPU Unit and the CPM2C's communications are controlled by
the DIP switch on the front of the CPU Unit.
CPM2A Communications Switch Setting
Turn OFF the Communications switch when using 1:1 PC Link communications.
CPM2A CPU Unit
RS-232C port
Slave
Link bits
LR00
Read
area
LR07
LR08
Write
area
LR15
Section 4-3
Read
Write