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A-2 Vanguard Multiport 4520CP Controller User’s Guide
when connecting a DCE device, such as a modem, to a Vanguard Multiport card,
use modem (or straight-through) cables. For DTE devices, such as terminals and
printers, use null-modem cables.
Since cabling accounts for most installation problems, this appendix describes the
different types of cables to use. You should check the design of the cables you buy
against the cables defined in this chapter to verify that you have the correct cables.
Serial Connector Pinouts
Terminals, modems, and printers typically communicate through an RS-232 (serial)
interface. All of the DB-25 connectors are DTE type RS-232 compatible serial
connectors.
Figure 6 shows the location of the RS-232 pins supported by the Vanguard Multi-
port cards.
FIGURE 6. Serial Connector Pin Diagram (male DTE)
Table shows the connector pinouts for both asynchronous and synchronous
devices. Table provides a description of each signal.
Serial Connector Pinout
Pin Number
RS-232
Signal
V. 2 4
Signal
Direction
1 Chassis GND 102 None
2 TXD 103 Output
3 RXD 104 Input
4 RTS 105 Output
5 CTS 106 Input
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