Super Systems AC20 - Manual (Page 13)

11
Fig. 11.B OUTPUT 7 WIRING
NOTES NOTES NOTES NOTES NOTES:
1) Do not run analog output wires together with AC power
cables.
2) Out 6 and 7 are isolated outputs.
3) The maximum load is equal to 600
Ω .
+
_
Shield
_
+
19
+
_
G
18
19
18
OUT 7
OUT 7
20 mA
20 mA
+
_
21
20
COMMON
22
B'/B B/B'
A/A' A'/A
M
A
S
T
E
R
I
N
S
T
R
U
M
E
N
T
D) SERIAL INTERFACE D) SERIAL INTERFACE D) SERIAL INTERFACE D) SERIAL INTERFACE D) SERIAL INTERFACE
RS-485 interface allows you to connect up to 30 devices with
one remote master unit.
Fig. 12 - RS-485 WIRING
The cable length must not exceed 1.5 km at 9600 BAUD.
NOTES
NOTES NOTES NOTES NOTES:
1) This is an isolated RS 485 serial interface.
2) The following report describes the signal sense of the voltage
appearing across the interconnection cable as defined by
EIA for RS-485.
a) The ” A ” terminal of the generator shall be negative with
respect to the ” B ” terminal for a binary 1 (MARK or OFF)
state.