L-GAGE
®
LT7 Long-Range Time-of-Flight Sensor
P/N 120244
13
Banner Engineering Corp.
•
Minneapolis, MN U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
Serial Communications
Factory delivery status settings are underlined below.
Serial Select (RS422/SSI)
With Serial Select it is possible to select the interface from RS422-compatible,
SSI1/10-compatible, or SSI1/8-compatible connections.
RS422-/ or SSI-Compatible
Depending on the setting made in Serial Select, the appropriate interface parameters
are displayed or altered. The following settings are possible:
•
RS422
Baud rate:
4.8 or 9.6 or 19.2 or 38.4 or 57.6 kBaud
Data bit:
8 or 7
Stop bit:
1 or 2
REPEAT or SINGLE:
REPEAT: the sensor continuously sends measured data via the
serial interface without waiting for a request.
SINGLE mode: a string of measured data is supplied only on
request.
Parity
:
even (but not shown on LCD menu)
•
SSI:
1/10
= LSB = 0.1 mm (10MIL) or
1/8
= LSB = 0.125 mm (8MIL)
6 possible codes:
BINARY24
BINARY24E
BINARY25
GRAY24
GRAY24E
GRAY25
Serial Response Speed
The distance measurement inside the sensor is recalculated every 12 ms. It is not a
moving average, but rather a new average is calculated for the previous 12 ms of data.
With the SSI output, the data can be read every 1.4 ms (likely the “same” reading for 8
or 9 readings, then a change). For most accurate target location prediction, sample at
the 1.4 ms read rate of the SSI and see “when” the change happens. Worst case, that
data will be for the average target location over the previous 12 ms, plus 1.4 ms delay
(i.e., the 12 ms average was changed just after the previous read started).
