Serial Interface - ero electronic LIMITROL LHL Mode D'emploi

D) SERIAL INTERFACE (option) D) SERIAL INTERFACE (option)
D) SERIAL INTERFACE (option) D) SERIAL INTERFACE (option) D) SERIAL INTERFACE (option)
RS-485 interface allows to connect up to 30
devices with one remote master unit.
I
A/A'
N
4
S
T
B/B'
R
5
U
M
COMMON
E
6
N
T
Fig. 12 - RS-485 WIRING
The cable length must not exceeded 1.5 km at
9600 BAUD.
NOTES NOTES
NOTES NOTES: NOTES
1) This RS 485 serial interface is insulated.
2) The following report describes the signal sense
of the voltage appearing across the intercon-
nection 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.
b) The " A " terminal of the generator shall be
positive with respect to the " B " terminal for
a binary 0 (SPACE or ON).
I
N
S
T
R
U
A'/A
M
M
E
A
N
B'/B
S
T
T
E
I
R
N
S
T
R
U
M
E
N
T
Fig. 13
GB GB GB
GB GB 8
A/A'
4
B/B'
5
COMMON
6
4
5
6
A'/A
M
A
B'/B
S
T
E
R