Specifications

Page 7–2
FOCUS System Manual
Figure 7–1. Standard RS-232 Extension Cable
The technical specifications for Maintenance
Modules are shown in Tables 7-1 & 7-2.
7.1.1 Alternate PC Connection
In addition to the RS-232 craft interface on the
maintenance module, a FOCUS chassis with
Maintenance Module version 4 or 5 provides an
alternate way to connect a PC running FCS. Using
a special cable wired exactly as shown in Figure
7-2, you can connect your PC to the female DB-9
connector labeled "P4" (just above and to the left
of the power supply terminal block) on the rear of
the motherboard.
Connecting to the RS-232 craft interface on the
front of the Maintenance Module is the more
common method for communicating with
FOCUS. This is because it works with a standard,
off-the-shelf RS-232 extension cable. It also is
easily accessible; just remove the front panel.
Connecting your PC to FOCUS (MV4, MV5)
using the DB-9 connector on the rear of the moth-
erboard allows a more "permanent" connection,
without requiring you to remove the front panel.
This type of connection, however, requires a
special interface cable. For proper functionality
and to avoid damage to your PC, you must wire
this special cable exactly as shown in Figure 7-2.
Connecting a cable with different wiring can
severely damage your PC.
Note that you may connect your PC to FOCUS
using EITHER the DB-9 connector on the front of
the Maintenance Module OR the DB-9 connector
on the rear (MV4 or MV5 only) of the mother-
board. You MAY NOT use both connectors at the
same time, except with the MV5. When using the
FCA interface, there are additional connection
ASSIGNING PIN 1 ON THE SPECIAL
INTERFACE CABLE SHOWN IN FIGURE 7-2 TO
A CONNECTION ON YOUR PC WILL
SEVERELY DAMAGE YOUR PC.
WIRE THIS CABLE EXACTLY AS SHOWN.
CAUTION !
Female
1
2
3
4
5
6
7
8
9
Male
1
2
3
4
5
6
7
8
9
Male
1
2
3
4
9
5
6
7
8
DB-9 Female
2
3
5
6
7
8
DB-9 Male
4
3
2
7
6
5
Female
1
2
3
4
5
6
7
8
9
TX DATA (Data In)
TX DATA
RX DATA (Data Out)
RX DATA
CTS
CTS
RTS
RTS
DSR
DSR
GND
GND
PC
PC to FOCUS
(FOCUS)
Figure 7–2. Rear PC Connection (MV4 & MV5)