Mitsubishi Electric NF250-HEV, Instruction Manual

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5.6 MODBUS setting area (with MODBUS communication option)
MODBUS operation precautions
[1] Prior to powering the transmission line for MODBUS communication, set the address for each device.
MODBUS devices use these addresses to communicate, so setting them is very important.
[2] Use a thin stick to operate the address setting switches, and make sure that they have been switched all the way to the one to set.
Operate the address setting switches at 10 N or less.
[3] If the address setting switches are operated after turning the control power supply on, the set address will not be recognized unless
the reset switch is pressed.
[4] Use a thin stick to firmly press the reset switch.
[5] Do not use a mechanical pencil to operate the switch. The lead could enter the gap in the switch, resulting in erroneous operation and even
causing failure.
Caution
(2) MODBUS parity bit setting switches
These switches are used to set the MODBUS communication parity bit. (Factory setting: ON, EVEN)
(1) MODBUS address setting switches
These switches are used to set the addresses for MODBUS communication. (Factory setting: ON, EVEN)
Set the addresses so that there are no duplicate ones set on the same transmission route.
Setting example: Values of the switch when turned ON are 16 and 1.
16 + 1 = 17
Address is 17.
(4) MODBUS communication speed (baud rate) setting switch
This switch is used to set the MODBUS communication speed.
(Factory setting: 19200 bps)
(5) Reset switch
The reset switch restarts the MDU status. If the stop bit setting switch, the parity bit setting switches, the address setting switches, or the
communication speed (baud rate) setting switch are operated after the control power supply is turned on, be sure to press the reset switch.
(6) Transmission signal LED
The transmission signal LED shows the state of the transmission signal.
Blinking : Transmitting
OFF : Transmission stopped
ODD, OFF
EVEN, OFF
ODD, ON
EVEN, ON NONE
NONE
EVEN
ODD
Switch setting Parity bit
2.4
4.8
9.6
19.2
38.4 2400
4800
9600
19200
38400
Switch setting Communication speed [bps]
(3) MODBUS stop bit setting switch
Open the cover for the setting area on the front of the MDU, and set the MODBUS communication stop bit using this switch. (Factory setting: 1 bit)
1-bit
2-bit
Switch setting Stop bit
1 bit
2 bits
Address setting switch
Parity bit setting switch
Stop bit setting switch
Baud rate setting switch
MODBUS
communication LED
Reset switch
S 1bit
ON
OFF
EVEN
38.4
9.6
4.8
2.4
RS
-48
5
ON
RESET
B RATE
64
32
16
8
4
2
1
2bi
t
19.2
PA
RITY
SD
RD
ADDRESS
ODD
kbps
38.4
9.6
4.8
2.4
B RATE
19.2
kbps
ON
S
2bit
1bit
ON
PARITY
EVEN ON
ODD OFF
ON
ADDRESS
64 32 16 8 4 2 1