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Installation
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CPS-MC341-DS1-111 Reference Manual (Hardware)
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48
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3.
RS-422A/485
RS-422A/485 Cable
Use the RS-422A/485 cable described below.
Cable
Twisted pair cable with the shield
Cable
Diameter
AWG28-16(0.08mm
2
- 1.25mm
2
)
Cable Length
Affected by the communication speed (baud rate) between the product and the external
device.
The cable should not exceed the length indicated in the table below.
Even the length is within the indicated one, as the amount of attenuation differs by the
material of the cables, communication abnormality may occur.
Estimated cable length and the communication speed
Cable Length
(m)
Communication
speed (bps)
300
115,200
600
57,600
900
19,200
1,200
9,600
The table below lists the maximum communication distances of the terminator resistor value
and individual cable diameters.
The terminators on the product
(100Ω)
and the terminators generally used with RS-
422A/485(120
Ω)
are listed.
Maximum communication distances of the terminator resistor value
(100Ω)
and cable diameter
Terminator Resistor (
Ω
) Cable Diameter
Maximum Communication
Distance (m)
100
AWG28
400
AWG26
700
AWG24
1100
AWG22
1200
Maximum communication distances of the terminator resistor value
(120Ω)
and cable diameter
Terminator Resistor (
Ω
) Cable Diameter
Maximum Communication
Distance (m)
120
AWG28
500
AWG26
800
AWG24
1200
AWG22
1200
*Refer to
in the
page 29
for details of the RS-422A/485 connector and
pin assignment.
