
B-63322EN-1/01 12. MAINTENANCE
-75-
No. External phenomenon Investigation method
3 (1) SR807
PARAMETER SETTING ERROR
(1) A required parameter is out of range.
1 Baud rate: parameter 5073 = 1 to 15, 5083=1 to 12
2 Number of stop bits: parameter 5072 or 5082 = 1 or 2
3 Protocol type: parameter 5074 or 5084 = 1 to 3
(2) SR855
DATA SET READY DOWN(RMT-BUF)
The DR signal is OFF or the CD signal (which can be
detected when the setting is RS232C and bit 4 of parameter
No. 5000 is 0).
1 A connector or signal line is not connected.
Check the signal line connections, referring to the
connection diagrams shown in Sections 3.2 and 3.3.
2 The I/O device is not turned on.
3 An I/O device detected an error.
(3) SR856
BUFFER OVWERFLOW(RTM-BUF)
The remote buffer is full.
1 An interruption (DC3/RS signal OFF) request cannot be
accepted.
(Error on the host)
(4) SR941
COMMUNICATION ERROR(RMT-BUF)
Software error on the NC
1 An illegal command code request was made from the NC.
(5) SR946
COMMUNICATION ERROR(RMTR-BUF)
Framing error, overrun error
1 The baud rate is not appropriate.
2 The number of stop bits is not set correctly.
3 Reception overrun