Omron NT620C, Operation Manual

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6-1 Section Operation of the Memory Link
245
that there is no area classification. The specification of bits is also the same.
A diagram of the PT memory is shown below.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Bits
Words
0000
0001
0002
9997
9998
9999
Reference - The PT memory is backed up by the battery even while the NT620S/NT620C
power is OFF.
- The explanations in this section concentrate on the memory link
communication method. For details on control and notification between the
NT620S/NT620C display elements and the PT memory, refer to Section 5 “Us-
ing Host Link/NT Link”.
6-1-3 Memory Link Commands
When using the memory link, data is sent and received between the host and
NT620S/NT620C using commands such as those indicated below.
Data Read Commands/Responses
These are the commands for reading the contents of the PT memory and
memory tables in the NT620S/NT620C. They are issued from the host and, as
the response, the NT620S/NT620C sends back the specified data.
There are the following three commands.
S
PT memory read command Page 249
S
Numeral memory table read command Page 251
S
Character-string memory table read command Page 252
Data Write Commands/Responses
These are the commands for writing data to the PT memory and memory tables
in the NT620S/NT620C. They are issued from the host and, as the response, the
NT620S/NT620C sends a reply indicating whether or not writing was completed
normally. It is possible to omit the response when writing is successful.
There are the following six commands.
S
PT memory write command Page 253
S
Numeral memory table write command Page 255
S
Character-string memory table write command Page 256
S
PT memory batch write (FILL) command Page 257
S
Numeral memory table clear command Page 257
S
Character-string memory table clear command Page 258