YOKOGAWA AXG1A Installation Manual page 61

NOTE
• If the hardware switch is set to "ON", the condition of
preventing parameter overwriting kept until the switch
is set to "OFF".
• For the software write protect, read the user's manual
of applicable communication type as listed in Table
1.1.
● Setting of Address Switch (ADDRESS)
This switch is only available for the product with Modbus
communication.
For the product with Modbus communication, it is
necessary to set the device address.
The device address can be set using either the address
switch (ADDRESS) (See Figure 6.3.1) or software
function with parameter setting.
• Address Switch (Position 7)
By using the address switch (Position 7), select the
device address to be used from the device address
specified by either the hardware switch or the
parameter setting.
Table 6.3.5 Address switch (Position 7)
Position of Switch
7 6 5 4 3 2 1 0
The device address set by Address Switch
1
(Position 0 to 6) is used.
0
7 6 5 4 3 2 1 0
The device address set by parameter
1
setting is used.
0
Factory setting.
• Address Switch (Position 0 to 6)
By using the address switch (Position 0 to 6), the
device address is set.
Setting range: 1 to 127
If the address switch is set to 0, the device address is
automatically converted to 1.
Setting example:
If only the address switch "position 6" is set to 1, the
resulting the device address is 64.
6 5 4
(1 * 2 + 0 * 2 + 0 * 2 + 0 * 2
Description
3 2 1 0
+ 0 * 2 + 0 * 2 + 0 * 2 )
<6. Operation>
● Setting of Line Termination Switch (SW2)
This switch is only available for the product with Modbus
communication.
Line terminations of two ends on the bus are required to
communicate Modbus.
One termination mode can be set using the line
termination switch (SW2) (See Figure 6.3.1).
Table 6.3.6 Line termination switch (SW2)
Position of Termination
Switch mode
1 2
Bus end
ON
OFF
1 2
Not bus end
ON
OFF
Both SW2-1 and SW2-2 must be set at the same position.
● Setting of Pull up and Pull down Switch
(SW3)
This switch is only available for the product with Modbus
communication.
When the bus is in an idling state, it becomes unstable
potentially without setting D1 for "pull up" and D0 for "pull
down".
Pull up and pull down mode can be set using the pull up
and pull down switch (SW3) (See Figure 6.3.1).
Table 6.3.7 Pull up and pull down switch (SW3)
Pull up and
Position of
Pull down
Switch
mode
1 2
ON Used
OFF
1 2
Not used
ON
OFF
Both SW3-1 and SW3-2 must be set at the same position.
LT Balanced Pair
B A C
R R
D D
ADMAG Slave n
Figure 6.3.2 Modbus connection
60
Description
Available when both SW2-1 and
SW2-2 are"ON".
(Resistance is 150 Ω)
Available when both SW2-1 and
SW2-2 are"OFF".
Factory setting.
Description
Available when both SW3-1 and
SW3-2 are"ON".
(Resistance : 600 Ω, Pull-up voltage:
+5 V)
Available when both SW3-1 and
SW3-2 are"OFF".
Factory setting.
Master
D
R
Pull Up
D1 (+) LT
D0 (-)
Common
Pull Down
LT:Line Termination
F0611.ai
IM 01E24A01-01EN