AND Multi Function Weighing Indicator AD-4402 Instruction Manual page 94

RS-485 2 Wire Connections
Settings RS-485
Host computer
AD-4402
No.1
AD-4402
No.32
Turn on
terminator switch
Settings of Parameters
Refer to "10.4. Parameter List" of the function list.
Timing Chart
Keep the delay time above 0.5 ms between the last response and the next command.
Set response time (tr).
Use a long delay time, when there is noise.
Use 4 ms or more from the output finish to receiveing the next command
Hi-Z: Hi impedance
Waiting time from command to
response: tr. Set tr at [ 03 f- 9 ].
Hi-Z
Host computer
AD-4402
Address 1
AD-4402
Address 2
Terminator resistor
100 ~ 120
A
B
FG
TERMINATOR
ON
OFF OFF OFF OFF
SDA
SDB
RDA
RDB
SG
FG
TERMINATOR
ON ON ON ON
OFF
SDA
SDB
RDA
RDB
SG
FG
[03 f- 9] < tr < [03 f- 9] + 50 ms
C L
@01RW
R F
Hi-Z
@01ST,NT,+0123.45kg
[03 f-11] [2]
1/2W
The host computer may have
inverse polarity terminals.
2 (SDA) and 3 (SDB)
connect nothing.
Use twisted-pair wire.
Use shield cable, if it is needed.
Connect a terminator
resistor at the indicator that
is the longest distance from
the host computer.
Waiting time until next
command: td > 4 ms
Hi-Z
C L
R F
Hi-Z
Page 92
The host computer may include
the terminator resistor.
Waiting time from
command to response: tr.
Set tr at [ 03 f- 9 ].
C L
@02RW
R F
Hi-Z
@02ST,NT,+0123.45kg
Hi-Z
C L
R F
AD-4402