Speco Technologies KBD-927 - Manual (Page 9)

9
2.1.2 Single Multiplexer
RS-485(-) PIN No.5
RS-485(+) PIN No.4
POWER
AC 24V
AL5
AL6
GND
AL7
AL8
GND
COM3
NC3
NO3
COM4
NC4
NO4
AL1
GND
AL2
AL3
GND
AL4
COM 1
COM 2
NO1
NC1
NO2
NC2
AC
+
RX
-(
T
X
-)
RX
+(
TX
+)
AC
-
(R
X
-)
FG
N
D
AC
+
AC
-
(R
X
+
)
GN
D
RS
-4
8 5
(RS-422)
(R
X
+ )
(R
X
-)
RX
+(
TX
+)
RX
-(
T X
-)
AC 24V
POWER POWER
AC 24V
BNC
MULTIPLEXER
SPOT MONITOR MAIN MONITOR
BNC
BNC
24 AWG #
Figure 3 – Single Multiplexer