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2 Instructions
2-374
CP1E CPU Unit Instructions Reference Manual(W483)
RXD
Applicable Program Areas
Operands
C: Control Word
Operand Specifications
Flags
Instruction Mnemonic Variations
Function
code
Function
RECEIVE RXD @RXD 235
Reads the specified number of bytes of data from
the CPU Unit’s built-in RS-232C port or the Serial
Option Board port.
Symbol
RXD
Area Step program areas Subroutines Interrupt tasks
Usage OK OK OK
Operand Description Data type Size
D First destination word UINT Variable
C Control word UINT 1
N Number of bytes to store 0000 to 0100 hex (0 to 256 decimal) UINT 1
Area
Word addresses Indirect DM addresses
Constants CF
Pulse
bits TR bits
CIO WR HR AR T C DM @DM *DM
D
OK OK OK OK OK OK OK OK OK
---
--- --- ---
C, N OK
Name Label Operation
Error Flag P_ER • ON if no-protocol mode is not set in the PLC Setup.
• ON if the value of C is not within range.
• ON if the value for N is not between 0000 and 0100 hex.
• OFF in all other cases.
RXD(235)
D
C
N
D: First destination word
C: Control word
N: Number of bytes to store
0000 to 0100 hex (0 to 256 decimal)
C
812 3415 0711
Byte order
0 Hex: Most significant byte to least significant byte
1 Hex: Lest significant byte to most significant byte
CS and DR signal monitoring
0: No CS and DR signal monitoring
1: CS signal monitoring
2: DR signal monitoring
3: CS and DR signal monitoring.
Always 0
Serial port specifier
1: CPU Unit’s RS-232C port
2: Serial Option Board port