Welding System User Manual
E6581301
B-16
2
2.3.3 RS485 communication connector
The VF-AS1 is equipped with two connectors: a two-wire RS485 connector (on the operation panel) and a four-wire
RS485 connector. The two wire RS485 connector is used to connect an external option (such as remote keypad or
computer) to the inverter. To connect to a network, use the four-wire RS485 connector, following the instructions
below.
2-wire RS485 4-wire RS485
Signal
name
Pin
number
Description
Signal
name
Pin
number
Description
DA 4 Same phase data RXA 4 Same phase reception data (positive line)
DB 5 Anti-phase data RXB 5 Anti-phase reception data (positive line)
SG 8 Ground line of signal data TXA 3 Same phase transmitting data (positive line)
This table shows signal line of inverter side. TXB 6 Anti-phase transmitting data (positive line)
* Never use pin-1, 2, 3, 6 and 7. SG 2, 8 Ground line of signal data
This table shows signal line of inverter side.
(Example: RXA signal is received by inverter.)
* Never use pin-1 (P24) and pin-7 (P11).
■ CRQQHFWLRQ diagram for 4-wire RS485 communication
!
Terminating
resistance
!
100
Ω
-1/4W
!
AS1 (slave)
!
Upper computer
or VF-
AS1
(master)
!
RXA
!
!
RXB
!
TXA
!
TXB
!
SG
!
RXA
!
RXB
!
TXA
!
TXB
!
SG
!
RXA
!
RXB
!
TXA
!
TXB
!
SG
!
RXA
!
RXB
!
TXA
!
TXB
!
SG
!
cross each other
!
straight
!
straight
!
AS1 (slave)
!
AS1 (slave)
!
■ Note
* Separate the communication line and the main circuit wiring by 20cm or more.
* Never use pin-1 (P24) and pin-7 (P11).
* Connect RXA and RXB, between TXA and TXB using twisted pair cable.
* Connect terminating resistances at both ends of a transmission line.
* When using 2-wire type, short RXB to TXB and RXA to TXA.
When connecting a communications device via the two-wire connector, carefully read the precautions for use in the
operating manual for the communications device.
* When connecting the VF-AS1 to other inverters, you do not need to connect the master receive lines (pins 4 and 5)
or the slave send lines (pins 3 and 6).
2-wire RS485 communication
4-wire RS485 communication
Pin-1 Pin-8