281
Auxiliary Area and CIO Area Allocations (Modbus-RTU Slave Mode) Section 9-3
CIO
1905
CIO
1915
n + 5 n + 15 12 to 15 Port
setting
status
Setup
settings
Serial communications mode (A hex: fixed)
08 to 11 Baud rate (Note 1)
05 to 07 Reserved
04 Start bits: Always 0
03 Data length: Always 1
02 Stop bits (Note 2)
01 Parity: Yes/No (Note 1)
00 Parity: Even/Odd (Note 1)
CIO
1906
CIO
1916
n + 6 n + 16 15 Hard-
ware
settings
0 No 0 RS-232C 1 RS-422A/485 1 Reserved
14 0 1 0 1
13 0: Terminating resistance OFF
1: Terminating resistance ON
02 to 12 Reserved
01 1: Setup error; 0: Setup normal
00 1: Port operating; 0: Port stopped
CIO
1907
CIO
1917
n + 7 n + 17 11 to 15 Commu-
nica-
tions
status
Reserved
10 1: Remote Unit busy receiving (Flow control)
0: Remote Unit ready to receive (Note 3)
09 Reserved
08 1: Local Unit busy receiving (Flow control)
0: Local Unit ready to receive (Note 4)
07 Trans-
mission
control
signal
status
ER signal
06 DTR signal
05 Reserved
04 CTS signal
03 RTS signal
00 to 02 Reserved
CIO
1908
CIO
1918
n + 8 n + 18 15 Trans-
mission
error sta-
tus
1: Transmission error; 0: No transmission error
14 to 08 Note used.
07 1: CRC error, 0: Normal
06 to 05 Note used.
04 1: Overrun error; 0: Normal
03 1: Framing error; 0: Normal
02 1: Parity error; 0: Normal
00, 01 Reserved
CIO
1909
CIO
1919
n + 9 n + 19 15 to 00 Number of normally received commands
CIO
1910
CIO
1920
n + 10 n + 20 15 to 00 Number of normally sent responses
CIO
1911
CIO
1921
n + 11 n + 21 15 to 00 Number of overrun errors, framing errors, and parity errors (transmission
errors)
CIO
1912
CIO
1922
n + 12 n + 22 15 to 00 Number of CRC errors (transmission errors)
CIO
1913
CIO
1923
n + 13 n + 23 15 to 00 Number of command format errors (illegal function codes and illegal
addresses)
CIO
1914
CIO
1924
n + 14 n + 24 15 to 00 Reserved.
Words Bit Contents
Boards
(CS Series only)
Units
(CS/CJ Series)
Port 1 Port 2 Port 1 Port 2
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