GW PN/ASCII...
12
PHOENIX CONTACT
3886_en_A
2.3.2
Connecting the RS-422 cable
Figure 2-3
Pin 1 location
In RS-422 mode, a point-to-point connection can be established. Use a twisted-pair,
common shielded bus cable to connect the I/O device.
To connect the RS-422 cable:
1.
Connect the individual conductors of the data cable to the GW PN/ASCII... using a
SUBCON 9/F SH (Order No. 2761499).
2.
Make sure the signal assignment is correct.
This operating mode supports full duplex transmission mode.
2.3.3
Connecting the RS-485 cable
In RS-485 mode, an RS-485 network with several I/O devices can be created. Use a
twisted-pair, common shielded bus cable to connect the I/O devices.
Connect the individual conductors of the data cable to the GW PN/ASCII... using a
SUBCON 9/F SH (Order No. 2761499) (see Table 2-2).
Table 2-2
D-SUB 9 to RS-422 and RS-485 pin out
GW PN/ASCII...
End device
RS-422
RS-485
RS-422
RS-485
2
T(A)
–
D(A)
–
3
D(A)
D(A)
T(A)
D(A)
5
GND
GND
GND
GND
7
D(B)
D(B)
T(B)
D(B)
8
T(B)
–
D(B)
–
1
NOTE:
Observe the polarity of the RS-485 cable.
Fit this bus cable with a termination network at the two furthest points of the RS-485
network.
The termination resistors are integrated in the GW PN/ASCII... and can be switched on
through the web-based management interface.
