Owner`s manual

74
9.1 V71 EIA-232 LINE INTERFACE
See Section 9.1.1 if using DB-25 cabling (default) or
Section 9.1.2 if using RJ-45 cabling.
9.1.1 V71 DB-25 CABLING FOR EIA-232
The DB-25 port on the V71 has a male DTE type
connector and uses the following pins and signals for
communication:
DB-25 PIN/SIGNAL DEFINITION FOR EIA-232 LINE INFORMATION
Pin# EIA-
232
Signal
Direction Description
1 PGND ---- Protective Ground
2 TX Output Transmit Data (data out)
3 RX Input Receive Data (data in)
4 RTS Output + 12 volts when the M16/M8 DAC is powered up.
5 CTS Input Handshake In, enable/disable the transmission of
characters
7 SGND ---- Signal Ground
20 DTR Output Handshake Out, enable/disable the receiving of
characters
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 Figure 12 on the following page. 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 Figure 13 on the following page.