Appendices
A - 10
NX-series Communications Interface Units User’s Manual (W540)
Precautions for Correct Use
Output SID Specifications
The send buffer in the CIF Unit is cleared if the Output SID is 00 hex.
No send data is stored in the send buffer in the CIF U
nit until an Output SID with a value of 01
hex is received. In this case, an error does not occur.
The send data is also not stored in the send buffer in the CIF Unit if the value of the
Output SID
is not one higher than the value of the last received SID. In this case, an error does not occur.
• The following table shows the Output Data Type. You can access this data as WORD data or BOOL
data.
• The following table shows the command code of the control command. If the set value is out of
range, 0002 hex (undefined command) is returned in the Input Sub Info from the CIF Unit.
*2. This is the operating status of the communications master.
00 hex: Not ready to receive.
Not 00 hex: Ready to receive. The value is the Output SID
of the divided data that the CPU Unit or communications master
received last.
*3. If the set value exceeds 80, a setting of 80 bytes will be used.
*4. This is the send data that the CIF Unit sent to the serial
line or the control command for the CIF Unit.
You can change the number of output data in the I/O entry on the Support Software.
Bits Description
12 to 15
Indicates presence of send data sent by
the
CIF Unit to the serial line
*1
0 hex: No data sent.
1 hex: Data sent but not the last.
2 hex: Last send data.
*1. The CIF Unit will not perform any processing if the set value is out of range.
08 to 11
Indicates presence of control co
mmand for CIF Unit
*1*2
0 hex: There is no control command.
1 hex: There is a control command.
*2. Both send data and a control command can be sent at the same time.
00 to 07
*3
*3. You cannot read or write this data as BOOL data. To issue a control command, access the
data as WORD data.
Indicates command code of control command (See below for details.)
Command
code (hex)
Command name Description
01 Restart Port Restarts the port.
04 Clear Receive Buffer Clears the receive buffer in the CIF Unit.
05 Clear Send Buffer Clears the send buffer in the CIF Unit.
06 Clear Send and Receive
Buffers
Clears the send and receive buffers in the CIF Unit.
11
ER Signal ON
*1
Turns ON the ER signal.
12
ER Signal OFF
*1
Turns OFF the ER signal.
13
RS Signal ON
*1*2
Turns ON the RS signal.
14
RS Signal OFF
*1, *2
Turns OFF the RS signal.
21 Change Number of Char-
acters to Determine the
End
Changes the Number of Characters to Determine the End to
th
e value
specified in the Output Sub Info.
*3
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