Serial Rs485 Communication Connector - Toshiba TOSVERT VF-AS1 Instruction Manual

2.3.3 Serial RS485 communication connector

The VF-AS1 is equipped with two connectors: a two-wire RS485 connector (on the front panel of the main unit) and a
four-wire RS485 connector. The two wire RS485 connector is used to connect an optional peripheral device (such as
extended control device or computer) to the inverter. To connect to a network, use the four-wire RS485 connector,
following the instructions below.
2
4-wire RS485
Signal Pin
name number
RXA
RXB
TXA
TXB
SG 2, 8
This table shows signal line of inverter side.
(Example: RXA signal is received by inverter.)
* Never use pin-1 (NC) and pin-7 (P11).
Connecting diagram for RS485 communication
Upper computer or
VF-AS1 (master)
Note
* Separate the communication line and the main circuit wiring by 20cm or more.
* Never use pin-1 (NC) and pin-7 11(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).
Description
4 Same phase reception data (positive line)
5 Anti-phase reception data (positive line)
3 Same phase transmitting data (positive line)
6 Anti-phase transmitting data (positive line)
Ground line of signal data
cross each other
AS1 (slave)
RXA RXA
RXB RXB
TXA TXA
TXB TXB
SG SG
2-wire RS485 communication
4-wire RS485 communication
2-wire RS485
Signal
name number
DA
DB
SG
This table shows signal line of inverter side.
(Example: RXA signal is received by inverter.)
* Never use pin-1, 2, 3, 6 and 7.
straight
AS1 (slave)
RXA
RXB
TXA
TXB
SG
B-14
E6581301
Pin
Description
4 Same phase data
5 Anti-phase data
8 Ground line of signal data
straight
AS1 (slave)
RXA
RXB
TXA
TXB
SG
Terminating
resistance
120 Ω -1/2w