Chapter 12 Operating Instructions
DME5000
120 © SICK AG • Germany • Subject to change without notice 8009813/ZJV1/2017-05
12.3 SSI
Data transfer with the setting "SSI" takes place on request of the control, with cycle time
and transfer speed being adjustable in a large range.
For this, a cycle sequence is put on the DME reception input by the connected control unit.
With each positive cycle flank, a data bit is pushed onto the DME transmission line,
starting with the highest bit. Between two cycle sequences, there is a cycle break of at
least 30 µs. The bit cycle is between 70 kHz and 500 kHz and depends on the line length.
Line length [m] Transmission rate [kBaud]
< 25 < 500
< 50 < 400
< 100 < 300
< 200 < 200
< 400 < 100
Impulse chart for data transmission
m = Stored parallel information
tv = Delay time for the 1st cycle, max. 540 ns, for all others max. 360 ns
Gn = Highest-value bit in gray code
T = Period duration of a cycle signal
GO= Lowest -value bit in gray code
tm = Mono flop time 15 µs to 25 µs
Tp = Cycle pause
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