Baumer N 141 - Manual (Page 12)

N 141
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Note: Only the bits marked ‘X’ may be altered. The permanent parameters „1“ and „0“ must not be altered since
this might create a control token ( tokens < 20h) what is not permitted in ASCII protocol.
Example 1: Read bit parameter (Data1 to Data3 = 80h; Data4 to Data5 = 30h)
SOH Adr Cmd EOT CRC
Transmission
01h 20h 61h 04h 4E
Example 2: Write bit parameter (positioning direction = Down; turn display = On)
SOH Adr Cmd Data1 Data2 Data3 Data4 Data5 EOT CRC
Transmission
01h 20h 61h 81h 84h 80h 30h 30h 04h 91h
SOH Adr Cmd Data1 Data2 Data3 Data4 Data5 EOT CRC
Response
01h 20h 61h 81h 84h 80h 30h 30h 04h 91h
Explanation of parameter „a“
Positioning direction
This parameter defines the positioning direction to head for the target. Compensating tolerances, for example at
cogwheels, joints, shafts etc during a precise positioning operation requires a tolerance compensation. The
tolerance compensation is proceeded by heading for the target position always from the same direction by so-
called loops. Loops mean that the target position is first crossed by a defined distance and then headed for from
the opposite direction. The parameter for the crossing distance is programmed by command “b”. Whether a loop
is required or not can be seen from the direction arrows on the display. A flashing arrow means tolerance
compensation required. Upon reaching the turning point the direction changes and the arrow stops flashing. A
target enabling direct positioning is marked by a non-flashing arrow. Upon reaching the target within the
programmed tolerances (see command “b”) the arrows will not disappear until the required tolerance
compensation was completed.
00 = Up Direct positioning if target position > current position; otherwise proceed tolerance compensation
01 = Down Direct positioning if target position < current position; otherwise proceed tolerance compensation
Counting mode
This parameter assigns either „ascending“ or „descending” counted values in relation to the shaft’s direction of
rotation. Following parameters are available:
00 = Up Clockwise rotation, ascending counted values
01 = Down Clockwise rotation, descending counted values
Arrows
This parameter relates to the arrows in the display that indicate the operator the correct direction (to the right or to
the left) of the new positioning operation. The following parameters are available:
00 = Up If current value < target = arrow to the right; current value > target = arrow to the left
01 = Down As „Up“, but inverted direction of the arrows
10 = Uni If current value ≠ target indicate both arrows
11 = Off Ever hide arrows
Rounding the current value
This means that the current value being within the tolerances but still differing from the target is rounded up or
down to the target value as soon as the shaft remains idle for approx. 3 seconds. The rounding operation is only
visual, the true internal current value remains unchanged. For current value readout by serial interface (command
“R”) the true, not rounded current position value is provided. The true current value will immediately reappear on
the display upon actuating a key. If the position is still within the tolerance window the rounding operation will be
repeated after 3 seconds.
Note: In operating mode „Hide target = Ever“ the target is deactivated and the SPA serves as a pure current
value display with disabled rounding function. The following parameters are available:
0 = Off Rounding the current value disabled
1 = On Rounding the current value enabled
SOH Adr Cmd Data1 Data2 Data3 Data4 Data5 EOT CRC Bit parameter default
Response
01h 20h 61h 80h 80h 80h 30h 30h 04h F1