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9.4.4
Binary protocol 4 request sequences
Cyclical request of position data
The simplest request sequence is the cyclical request with the function identifier 90
Request position data. An answer is sent within 4 ms.
With positioning mode enabled, the response contains the defined status information and
the position data. If no valid position data can be determined, the status bit OUT is set to 1.
If positioning mode is deactivated, the BUSY response is sent; i.e. the bits DIA0 to DIA3 and
the bit OUT are set to 1 in the status byte of the response telegram. 0 is sent as a position
value.
Requesting a one-time transmission of position data
In order to obtain as short a response time as possible, the following sequence must be
performed with positioning mode deactivated:
• Request telegram is sent with the function identifier 92
mode.
• The BPS activates positioning mode and sends the defined BUSY response within
4 ms.
• After ≥ 35ms, a request telegram is sent with the function identifier 91
Request one-time transmission of position data.
• Position data are present in the BPS, and the response telegram is sent within 4 ms.
Positioning mode is automatically deactivated.
This sequence is especially suited to position data determination over long distances; i.e.
where position data are required at greater time intervals (100 ... 1,000 ms) and with
reduced precision.
Advantages:
• Due to the combination of the requests Activate positioning mode and Request
one-time transmission of position data, a response is sent within 4 ms. With
request cycle times of ≥ 35ms, an alternating request from Activate positioning
mode and Request one-time transmission of position data can be implemented.
• The BPS does not work permanently in positioning mode for requests with the func-
tion identifier Request one-time transmission of position data.
Disadvantages:
• The polling sequence must be actively controlled in the control.
Leuze electronic
Protocols for position value output
BPS 8
(5C
) Activate positioning
d
h
(5B
d
(5A
)
d
h
)
h
107
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