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RS-232C Units Section 6-2
C: Control Words (C: First Control Word)
Source Words (S: First Source Word)
D: Transmission Information (Destination Unit and Number of Words).
Response Storage Words
Results are stored as shown in the following table.
Word Contents (Hex) Meaning
C 1B FE Master’s node address: 27
Master’s Unit address: FE Hex
Word Contents (Hex) Meaning
S 82 07 Response storage words: DM2000
82 Hex: DM Area, 07D0 Hex: 2000 words
(For more detail, refer to the PLC Operation
Manual.)
S+1 D0 00
S+2 00 64 Response monitoring time: 10 s
S+3 00 09 No. of bytes of command data: 9 bytes (No. of
bytes from S+4 onwards.)
S+4 28 01 EXPLICIT MESSAGE SEND command code: 28
01 Hex
S+5 0E 0E Slave node address: 14
RS-232C RECEIVE DATA READ response ser-
vice code: 0E Hex
S+6 00 94 Class ID: 0094 Hex
S+7 00 02 Instance ID: For port 1: 0002 Hex
S+8 64 00 Attribute ID: 64 Hex
Word Contents (Hex) Meaning
D 05 09 Master’s Unit address: 5, No. of words of com-
mand data: 9 words (specified in BCD) (No. of
words from S onwards)
Word Contents (Hex) Meaning
DM2000 28 01 EXPLICIT MESSAGE SEND command code: 28
01 Hex
DM2001 00 00 Response code (0000 Hex: Normal completion)
DM2002 00 xx No. of received bytes (data length after D+3)
DM2003 0E 8E Slave node address: 14
RS-232C RECEIVE DATA READ response ser-
vice code: 8E Hex
DM2004 on HH LL... The receive data read from RS-232C port 1 is
stored in sequence from the leftmost bit to the
rightmost bit.
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