Delta DVP-ES2 - Manual (Page 327)

3 . I n s t r u c t i o n S e t
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Sending data: (PLC→External equipment)
D100L D101L D102L D103L
Source data register, starting from
lower 8 bits of D100
Length = 4
Receving data: (External equipment→PLC)
D120L D122L D123L D124L D125L D126L D121L
Registers for r starting from
lower 8 bits of D120
eceived data,
Length = 7
Points to note:
1. PLC COM1 RS-232: Associated flags (Auxiliary relays) and special registers (Special D) for
communication instructions RS / MODRD
Flag Function Action
M1138
COM1 retain communication settings. Communication settings will be
reset (changed) according to the content in D1036 after every scan
cycle. Users can set ON M1138 if the communication protocol
requires to be retained. When M1138 = ON, communication settings
will not be reset (changed) when communication instructions are
being processed, even if the content in D1036 is changed.
Supported communication instructions: RS / MODRW
User
sets and
resets
M1139
COM1 ASCII / RTU mode selection, ON: RTU mode, OFF: ASCII
mode.
Supported communication instructions: RS / MODRW
User
sets and
resets
M1312
COM1 sending request. Before executing communication instructions,
users need to set M1312 to ON by trigger pulse, so that the data
sending and receiving will be started. When the communication is
completed, PLC will reset M1312 automatically.
Supported communication instructions: RS / MODRW
User
sets and
system
resets
M1313
COM1 data receiving ready. When M1313 is ON, PLC is ready for
data receiving
Supported communication instructions: RS / MODRW
System