Qihan RS485, Руководство пользователя

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5
Picture2-2.1
2.2.2 RS422 remote connection
RS422 connection line, one end connects with RS4 22 interface
（
REM OTE K EY BO
ARD( s) ) of CM6700 back plate, the other end connects with RS4 22 interface of the keyboard,
the keyboard interface RS 422
（
R + R-
）
corresponds with matrix interface RS 422
（
T + T-
）
, the
keyboard inter face RS 422
（
T+ T-
）
corresponds with matrix interface RS422
（
R+ R -
）
.
RS422 remote connection, the maximum distance
between the keyboard and the Matrixes 1200m.
2.3 Connect with the Dome Directly
You can connect with the dome by RS485 inter-face when the keyboard controls the dome
directly. The RS485 interface of t he dome is on the switch board of pendent hanger of the
upper cover of the dome. You can find the 4 Pin control/power socket and find the
corresponding RS485
（
A+
，
B-
）
interface according to the above mark when you turn the metal
button inside the hanger and open the switch board.
There are different connection ways according to the domes which produce by the different