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A-10 Vanguard Multiport 4520CP Controller User’s Guide
FIGURE 13. RS-232 Interface Signals Transmitted through the DB-25
Connector Pins
RS-422 and RS-485 Support (optional)
Since RS-422 and RS-485 are electrical specifications only, they can be supported
over many connectors. The Vanguard Multiport controllers support them over its
DB-25 output connectors using the functional pinout shown in Figure 14.
Both RS-422 and RS-485 specify balanced electrical operation. The main differ-
ence between the two specifications is that RS-485 allows multipoint connections
where RS-422 is point-to-point only. Note that EIA-530 refers to RS-422 for its
electrical specification.
GND (Chassis)
TxD
RxD
RTS
CTS
DSR
GND Signal
CD
1
2
3
4
5
6
7
8
9
10
11
12
13
TxCin
RxCin
TxCout
14
15
16
17
18
19
20
21
22
23
24
25
DTR