
Network Design
and Setup
3–15
Network Design and Setup
DL305 DCU Port Pinouts
There are two versions of the DL305
DCU.
S D3–232–DCU (RS232C version)
S D3–422–DCU (RS422 version)
The DL305 DCU can only be used as a
slave station interface. If you only have
one master and one slave, you can use
either version. If you have more than one
slave you should probably use the the
RS422 version. You can use the RS232C
version, but you’ll need an RS232C/
RS422 converter (FA–UNICON) for each
station.
DirectNET
Port
Port Pinouts
Pin 1 Pin 14
Pin Signal Definition
1 Not connected
2 Not connected
3 Not connected
4 Not connected
5 Not connected
6 Not connected
7 Logic ground 0V
8 Not connected
9 Not connected
10 RS422 RTS +
11 RS422 RTS –
12 RS422 CTS +
13 RS422 CTS –
Pin Signal Definition
14 RS422 data out +
15 RS422 data out –
16 RS422 data in –
17 RS422 data in +
18 Not connected
19 Not connected
20 Not connected
21 Not connected
22 RS422 data out +
23 RS422 data out –
24 RS422data in –
25 RS422 data in +
D3–422–DCU (RS422)
Pin Signal Definition
1 Not connected
2 RS232C TXD
3 RS232C RXD
4 RS232C RTS
5 RS232C CTS
6 Not connected
7 Logic ground 0V
8 Not connected
9 Not connected
10 Not connected
11 Not connected
12 Not connected
13 Not connected
Pin Signal Definition
14 Not connected
15 Not connected
16 Not connected
17 Not connected
18 Not connected
19 Not connected
20 Not connected
21 Not connected
22 Not connected
23 Not connected
24 Not connected
25 Not connected
D3–232–DCU (RS232C)
Pin labeling conforms to the IBM DTE and DCE standards.
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