Synrad FH FLYER - Page 102

stand-alone
operation
102
SYNRAD FH Series Flyer Operator’s Manual Version 3.4
Conguration
Bit masks
Several of Flyer’s Master Control File (MCF) keywords allow masking of input or output bits to
limit valid input or output states to a specic range. For example, the FileMask keyword causes
Flyer to scan up to 16 input bits when looking for a valid mark le match. By using a FileMask
value of 0x0F hex (15 decimal), you can narrow the valid input range down to the rst four
bits (inputs IN0–IN3).
Input masks
An input mask is required for FileMask and Strobe keywords. For example, the Strobe key-
word is used by the MCF strobed mode of operation to dene the input state causing FH Flyer
to perform another read of the inputs. The rst argument is the mask value and the second
argument is the required input state. The mask value forces Flyer to ignore any inputs outside
of the mask boundary. This concept is illustrated below:
Input example # 1:
Input # IN7 IN6 IN5 IN4 IN3 IN2 IN1 IN0
Current input state (0x5F) 0 1 0 1 1 1 1 1
Strobe mask value (0x03) 0 0 0 0 0 0 1 1
Desired input state (0x01) 0 0 0 0 0 0 0 1
Result of mask (0x03) 0 0 0 0 0 0 1 1
In this case, the mask result, 0x03, does not match the desired input state (0x01) and the
Strobe function will not occur. Flyer will continue to mark the previous mark le loaded into
memory.
Input example # 2:
Input # IN7 IN6 IN5 IN4 IN3 IN2 IN1 IN0
Current input state (0x5D) 0 1 0 1 1 1 0 1
Strobe mask value (0x03) 0 0 0 0 0 0 1 1
Desired input state (0x01) 0 0 0 0 0 0 0 1
Result of mask (0x01) 0 0 0 0 0 0 0 1
In example # 2, the mask result, 0x01, matches the desired input state (0x01). The Strobe
function is valid, which instructs Flyer to end the current mark session, read the current input
state, perform a le match and begin another mark session using a new mark le.