Owner`s manual

M SERIES DAC
CABLING
____________________________________________________________________________
9
If you are interfacing a DCE device such as a modem to the V71 DB-25 port, you
must use a straight cable as shown in Appendix D. If you are interfacing a DTE
device such as a terminal to the V71 DB-25 port, you must use a crossed or null
modem cable as shown in Appendix D.
V71 RJ-45 CABLING FOR EIA-232
The V71 provides EIA-232 line interface on the EIA-232 RJ-45 modular port. Most
serial computers, modems, and printers do not have RJ-45 modular connectors.
Adapters are required to convert from DB-25 or DE-9 connectors to modular
connectors. BayTech has a complete line of RJ-45 adapters and cables that make
your installation quick and trouble free. There are drawings, in Appendix D, of an RJ-
45 receptacle and plug where pin number assignments are given.
The V71 EIA-232 modular port uses the following signals:
EIA-232 RJ-45 PIN/SIGNAL DEFINITION
P
i
n
EIA-232
Signal
Direction Description
1 DTR Output Handshake Out, enable/disable the receiving of characters
2
GND ---- Signal Ground
3 RTS Output +12V when powered is applied, not used as a handshake
line
4 TX Output Transmit Data (data out)
5
RX Input Receive Data (data in)
6 N/A ---- Not Used
7 GND ---- Signal Ground
8 CTS Input Handshake In, enable/disable the transmission of
characters
COMPUTER INTERFACE, MODEM INTERFACE
An adapter is required to connect an IBM PC to the V71 serial port. The 9FRJ45PC-
1 and 25FRJ45PC-1 adapters are used for this connection. The 25MRJ45MD-1
adapter is used to connect to an external modem. The pinout for these adapters is
displayed in Appendix D.
IMPORTANT: When modular connectors are used, crossed RJ-45 cables
are required.