Serial data mode
105542_en_05 PHOENIX CONTACT 57 / 198
5.1 Frame-based data transmission
T
IdleMin
parameter (minimum pause between two frames)
The T
IdleMin
parameter refers to the minimum pause that must elapse between two frames
on the output side (wireless module is transmitting data via the serial interface).
Figure 5-4 Frame-based data transmission: T
IdleMin
parameter
T
FrameEnd
parameter
T
FrameEnd
is the time maintained by the transmitting wireless module between two frames.
If the data received by the wireless module is followed by a certain period of time where no
further data is received, the wireless module assumes that the frame has arrived in its en-
tirety. The frame is then transmitted. This period of time is referred to as T
FrameEnd
.
T
FrameEnd
must be shorter than the minimum interval between two frames
(T
FrameEnd
<T
IdleMin
). T
FrameEnd
must, however, also be greater than the maximum interval
that is permitted between two characters in a frame. Otherwise the frame might be frag-
mented.
Figure 5-5 Frame-based data transmission: T
FrameEnd
parameter
Frame 1
T
idleMin
Idle Idle Idle
Frame 2
T
idleMin
Frame 3
T
idleMin
Idle
Frame 1
OK
Frame 2
NOT OK
T
FrameEnd
T
FrameEnd
Idle Idle Idle
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