3. Installation
43
Serial Network Connection (COM 2)
The COM 2 isolated communication interface enables the connection to an RS-485/422 network. See
in the following the Hadron Xtorm CPU DB9 female connector with the proper identification and
signals description.
Figure 3-25 Hadron Xtorm CPU DB9 Female Connector
Pin
Signal
Description
1
-
Not used
2
Term+
Internal termination, positive
3
TXD+
Data transmission, positive
4
RXD+
Data reception, positive
5
GND
Negative reference to external termination
6
+5V
Positive reference to external termination
7
Term-
Internal termination, negative
8
TXD-
Data transmission, negative
9
RXD-
Data reception, negative
Table 3-11. Hadron Xtorm CPU DB9 Female Connector Pin Out
RS-485 Communication without Termination
In order to connect the Hadron Xtorm CPU COM2 interface to a RS-485 network without
termination, the identified terminals of the AL-1763 cable must be connected in the respective device
terminals, as shown in Table 3-12.
AL-1763 Pins
CPU Signals
0
Shield
1
Not connected
2
D+
3
D+
4
Not connected
5
Not connected
6
Not connected
7
D-
8
D-
Table 3-12. Connection between COM 2 with RS-485 without Termination