Page 90 AD-4402
RS-485 2 Wire Connections

Settings RS-485 [03 f-11] [2]

Settings of Parameters

Refer to 10.4. Parameter list of the function list.

Timing Chart

Keep delay time above 0.5 ms between last response and next command.

Set response time (tr). [03 f- 9] < tr < [03 f- 9] + 50 ms

Make long delay time, when there is noise.

Make 4 ms or more from output finish to receiveing 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 twist-pair wire.
Use shield cable, if it needs.
2 (SDA) and 3 (SDB)
connect nothing.
TERMINATOR
ON
OFF
OFFOFF
OFF
A
D-4402
No.32
TERMINATOR
ON
ONON
ON
OFF
Connect terminator resistor
at a indicator where is
longest distance from the
host computer.
Turn on
terminator switch
RD
A
RDB
SG
FG
SDA
SDB
RD
A
RDB
SG
FG
SDA
SDB
AD-4402
Address 1
Host computer @01RWCRLF
@01ST,NT,+0123.45kgCRLF
@02RWCRLF
AD-4402
Address 2
Hi-Z
@02ST,NT,+0123.45kgCRLF
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Waiting time unitl 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].