Chapter 5: Serial Communications
Page 5–11
DuRApulse GS4 AC Drive User Manual – 1st Ed, Rev A - 10/20/2017
rs-232C To rs-485 Conversion
An RS-485 network cable can span up to 1000 meters (4000feet). However, many
AutomationDirect PLCs have only RS-232C communication ports, and require an FA-ISOCON
(RS-232C to RS-422/485 network adapter) in order to make an RS-485 connection.
If an FA-ISOCON module is used, set the module dipswitches as required.
Refer to the FA-ISOCON manual for more detailed information.
FA-ISOCON Switch Settings:
•
S21–S23: OFF, ON, ON (19200 baud)
•
S24–S27: OFF (Automatic Network Transmit Enable)
•
Terminate: ON (end of run term resistors)
•
Bias (2): ON (end of run bias resistors)
•
1/2 DPX (2): ON (RS-485 TXD/RXD jumpers)
Helpful Hint: Some applications require that the FA-ISOCON
baud rate is set faster than the drive/network baud rate.
FA-ISOCON RJ-12 Serial Comm Port A
RS-232 Input Port
16
1: Signal Ground
2: CTS (input)
3: RXD (input)
4: TXD (output)
5: +5VDC in
FA-ISOCON Wiring
24VDC +
24VDC -
Connect shield
to signal ground
at one end only
6 GND
4 SG -
5 SG +
GS4
Comm Port
Node 2
6 GND
4 SG -
5 SG +
GS4
Comm Port
Node 1
120Ω Termination Resistor at both ends of network
[GS4 has a built-in terminating resistor controllable by switch SW5 above the I/O terminal strip]
120Ω Termination Resistor at both ends of network
[FA-ISOCON has a built-in terminating resistor
controllable by switch settings]
FA-ISOCON
RS-232 to RS-485 converter with ANTE
TXD +
TXD -
RXD -
RXD +
COM B
D
+V
COM A
C
A
TXD
RXD
CTS
RTS
3 RXD
4 TXD
2 CTS
6 GNDGND
S-232 to RS-485 Conversion Wiring Schematic
For information regarding configuration of AutomationDirect PLCs or other PLCs, please refer to
Appendix D of this user manual, or to the applicable PLC user manual for your application.
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