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6-8 VersaMax Serial to Ethernet Adapter User's Manual – July 2000 GFK-1852
6
User-Built Cable #4: VMSE RS-422 Terminals to PLC
This cable is not currently sold by GE Fanuc. Details are provides so you can build
your own cable.
Application:
Connects the VMSE terminal block screw terminals to a PLC 15-pin, D-sub, RS-
422/RS-485 port such as is used on Series 90-30, Series 90-70, and VeraMax PLCs.
Note that the VMSE switch must be set in the RS-422 position and the firmware
configuration parameter “Interface Type” must be set to RS-422 (“Interface Type”
set to RS-485 will not work).
To VMSE Screw
Terminals
Male Connector
(15-Pin, D-Sub)
To PLC
RS-422/485
Serial Port
Figure 6-12. VMSE Screw Terminals to 15-Pin D-Sub PLC Serial Port
RX (A) -
Signal Gnd. -
TX (A) -
TX (B) -
RX (B) -
1
2 - SD (A)
9
- Term. Resis.
1
- Shield
7
- Signal Gnd.
1
0 - RD (A’)
1
1 - RD (B’)
1
3 - SD (B)
VMSE
D
-Sub Connector
6
- RTS (A)
T
P*
TP = Twisted Pair
T
P*
1
5 - CTS (A’)
8
- CTS (B’)
1
4 - RTS (B’)
1
00 ohm, 1/2 w resistor**
*
*
If using a multidrop arrangement,
terminate only at the first and last
receive terminals.
**
*
Figure 6-13. Wiring Diagram
Specifications
•
D-Sub Connector: Male, 15-pin
•
Cable: Shielded, twisted-pair rated for RS-485 use. Ground shield at one end
only, as shown above.
•
Maximum cable length: 1200 meters (4,000 feet)
•
VMSE Switch setting: Set to RS-422 position (see Figures 6-2 and 6-3). Also,
the “Interface Type” configuration parameter must be set to RS-422.