beautypg.com

Connecting the cable, Hardware setup com-2(pc)f 32, Figure 3.10. example connection to a modem – Compaq Contec COM-2(PC)F User Manual

Page 41: Figure 3.11. example connection to a pc, Figure 3.12. example connection to a device

background image

Hardware Setup

COM-2(PC)F

32

Connecting the Cable

The RS-232C interface requires that you use a different type of
cable depending on the type of device being connected. For
example, modem connections and computer (PC) connections
require different cables. Accordingly, check the specifications of
the external device to which you are connecting and select the
appropriate type of cable. The two types of cable are "straight-
through" and "crossed". Also, if the signal lines require
conditioning in the connector, provide conditioning in accordance
with the specifications.

TXD
RXD
RTS
CTS
DTR
DSR
SG

External Device

(Transmit Data)
(Receive Data)
(Request to Send)
(Clear to Send)
(Data Terminal Ready)
(Data Set Ready)
(Signal Ground)

TXD

RXD

RTS
CTS

DTR
DSR

SG

Board

Figure 3.10. Example Connection to a Modem

TXD
RXD
RTS
CTS
DTR
DSR
SG

External Device

TXD
RXD

RTS
CTS

DTR
DSR

SG

Board

Figure 3.11. Example Connection to a PC

TXD
RXD
RTS
CTS
DTR
DSR
SG

External Device

TXD
RXD

RTS
CTS

DTR

DSR

SG

Board

Figure 3.12. Example Connection to a Device

This manual is related to the following products: