Net-2000™ Voice Codec Unit
User’s Manual
Page 5
DVSI Confidential Proprietary
Section 2 – Net-2000™ VCU Installation
RS-422
The Net-2000 VCU also provides a RS-422 interface as a communications channel between two
VCU units or some other device. The RS-422 interface follows industry standards of differential I/O
can be used as either a Asynchronous or Synchronous connection depending on the communication
requirements. Both RS-422 interfaces use the same packet protocols as the Ethernet interface as
described in Section 4.
The Synchronous RS-422 connection is available on the HD-15 connector located on rear panel of
the Net-2000™ VCU and provides the data clock and 8 bit frames. For pinout detail see Section 5
Table 56 RS-422 Syncronous Serial Port Pin Outs
The Asynchronous RS-422 connection is available on the RJ45 connector located on rear panel of
the Net-2000™ VCU and provides the data only in a 8,none, 1 format. . For pinout detail see
Section 5 Table 57 RS-422 Asyncronous Serial Port Pin Outs.
Asynchronous RS-422
Synchronous RS-422
OR
Figure 2 Connect two Net-2000™ VCU via RS-422
Connecting to RS-232
The RS-232 serial port located on the back of the Net-2000™ VCU unit provides low level set-up
functions. The interface itself consists of a simple command/response ASCII text protocol. You can
use a terminal or terminal emulator on a personal computer to type commands at a keyboard as your
user interface.
To connect the serial interface, to a Terminal or PC plug a straight-through modem cable (see pin
outs in Table 55 Serial Port Pin Outs) into the serial port DE-9s connector and plug the other end into
your terminal (or one of the serial ports on your PC if you are using an emulator). Set the terminal as
shown in Table 2 Serial Port Terminal Set-up.