Roland R1000 Series Manual page 96

Communication with the PLC
Meaning of the characters in the table:
0 = a 0 (zero) must be in this position
– = the characters in this position are immaterial
X = represents a digital value
E = single digit (least significant value)
Z = Number and Ten´s position of a number (e.g. ZZ )
H = Hundred´s position of a number
Q = Cross sum
• = Decimal point
The program interrogates only those bytes which are relevant for the function under consideration.
Example:
Byte 10 and 11 (dimension) have no meaning for the function select "Program n umber". The
program therefore ignores these bytes. The digits in Byte 11 and 12 have only a meaning for the
cross sum.
The following order of entries is mandantory when entering a parameter-program via the serial
interface:
1. Select program number
2. Sensor number / sequence
3. Communicate nominal thickness
4. Communicate limit threshold
Every command issued to the R1000 is acknowledged with a error status message. Exceptions are
requests for measurement values, down load and programs.
If the error status message contains an error code in Byte 8/9 which is different from zero, then it is
necessary to eliminate the cause of the fault.
In order to procede working with the unit it is necessary to acknowledge the error with the
command "Request error message/delete".
The fault cannot be acknowledged or deleted if the cause is not eliminated.
Commands issued from the R1000 (Version C only)
The R1000 responds to a request for measurement value or error code as follows:
Measurement value
Error status
If no measured value is present, then it supplies:
at mm:
at inch:
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96
Double Sheet Detector R1000 series E20
Byte Byte Byte Byte
0 1 2 3
STX - M +
STX - F +
STX,0,M,+,-,-,.,-,-,-,-,M,M,QH,QZ,QE,ETX
STX,0,M,+,-,.,-,-,-,-,-,I,N,QH,QZ,QE,ETX
Manual
Byte Byte Byte Byte Byte
4 5 6 7 8
X • X X X
0 0 0 0 ZZ
B0046991 / Rev. 1.6
Byte Byte Byte Byte Byte
9 10 11 12 13
X Dimension QH QZ
ZE - - QH QZ
Byte Byte
14 15
QE ETX
QE ETX