Specifications

Page 16–2
FOCUS System Manual
16.3 Installation
As with other FOCUS modules, we recommend
that you initially install and test the 232 modules
and interfaces in “test” chassis (i.e., chassis that
are not part of an operating network). This way,
you can quickly perform the acceptance test
without interfering with a live network. Whether
you are installing the modules in test chassis or
chassis that are on-line in a network, use the
installation procedure described here.
The Low Speed Data (232) Module occupies one
chassis slot. The module’s two channels require
two (2) time slots on the T1/E1 line. Note that the
232 module is presented as a Data
Communications Equipment (DCE) circuit, to the
connected external equipment with a DB9 female
connector.
Before installing the module and its interface,
make sure that:
• The FOCUS chassis is set up, energized,
and operational, with all necessary
common equipment (see Chapter 3)
• The FOCUS Configuration Software (FCS)
has been installed on your terminal (see
Chapter 3)
• Acceptance tests for the FOCUS chassis
and all previously installed equipment have
been done to rule out invalid test results for
this module
Figure 16–1. Typical RS-232 Application.
Referring to Fig. 16-1: Data terminal equipment (microcomputers, event recorders, etc.) at Substations
B and C are directly linked through the second RS-232 data circuit, or channel B. Data and control
signals are transparently transmitted across both circuits. The data transfer is asynchronous only.
NOTE
A minimum dead time of 10ms is required to
send handshaking information.