Product specifications

AD-4404 Page 109
RS-485 2 Wire Connections for Command Mode
Settings RS-485 [03 f-11] [2]
Caution
This connection can be used only with command mode.
Settings of Parameters
Refer to "11. Function List".
Timing Chart
Keep the delay time above 4 ms between the last response and the next command.
Set response time (tr). [03 f- 9] < tr < [03 f- 9] + 50 ms
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
A
D-4402
No.1
A
B
FG
Host computer
Terminator resistor
100 ~ 120Ω 1/2W
The host computer may include
the terminator resistor.
The host computer may have
inverse polarity terminals.
Use twisted-pair wire.
Use shield cable, if necessary.
2 (SDA) and 3 (SDB)
connect nothing.
TERMINATOR
ON
OFF
OFFOFF
OFF
A
D-4402
No.32
TERMINATOR
ON
ONON
ON
OFF
Connect a terminator
resistor at the indicator that
is farthest from the host
computer.
Turn on
terminator switch
RD
A
RDB
SG
FG
SDA
SDB
RD
A
RDB
SG
FG
SDA
SDB
AD-4404
Address 1
Host computer
@01RW
C
R
L
F
@01ST,NT,+0123.45kg
C
R
L
F
@02RW
C
R
L
F
AD-4404
Address 2
Hi-Z
@02ST,NT,+0123.45kg
C
R
L
F
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Waiting time until next
command: td > 4 ms
Waiting time
f
rom command to
response: tr. Set tr at [
03 f- 9].
Hi-Z
Waiting time
f
rom
command to response: tr.
Set tr at [
03 f- 9].