Unipulse F805AT-BC, Руководство по эксплуатации

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9.OPTION (Option card required)
148
9-4. RS-485 Interface [485]
9-4-1. Communication specifications
Signal Level: RS-485 compatible
Transmission Distance: Approx. 1km
Transmission method:
Asynchronous, full-duplex
Transmission speed: 1200, 2400, 4800, 9600, 19200, or 38400 (selectable)
Bits configuration: Start bit: 1
Character length: 7 or 8 (selectable)
Stop bit:
1 or 2 (selectable)
Parity: none, odd or even (selectable)
Terminator: CR+LF, or CR (selectable)
Communication code:
ASCII
9-4-2. One to One connection
A
SD
RS-485
・
Mark (OFF)
V
A
-V
B
<-0.2V
・
Space (ON)
V
A
-V
B
> 0.2V
A
B
SD
A
B
RD
A
B
RD
A
B
SD
A
B
A
B
F805AT-BC
PLC,
Terminal resister
(Master) (Slave)
－
B ＋
A
RD
－
B
＋
SG
・
Simple two parallel wires cable can be used for minimum distance
connection, but the use of twisted-pair cables is recommended for better
noise tolerance.
・
The communication cable should end with an approx. 120 Ω terminal
resister on the receiver side.
・
The terminal SG is a grand terminal used on the circuit for protecting the
circuit.
When the main body of F805AT-BC and the device connected to
F805AT-BC are grounded by D type ground, there is usually no need to
use the terminal SG.
However, confirm the specifications of the devise connected before
connecting the terminal SG, when it is necessary to connect it according
to the situation of the site.
or PC
Terminal resister