SM500A—Automatic Switching System
Black Box Corporation
12
990-000-0001-E8
3. Remote system gang switching via contact closure
. This card has an
additional capability of performing system gang switching activated by an
external control voltage. This functionality is available through the
“CONTACT CLOSURE SWITCHING” port. The controlling voltage can be
supplied from an RS232 control lead or any other source switched between
+12V and -12V or from an external relay or switch contact using +12V and
-12V available at the “CONTACT CLOSURE SWITCHING” connector
through a 1K ohm resistor. Switching to “A” re12V. Switching to “B”
requires -12V. For setup, refer to the installation procedures. This function is
independent of the key-operated switch position. This function can be
extended to the entire system by interconnecting all the Power
Supply/Control Cards using RJ-11 cables at the “GANG IN/GANG OUT”
ports. System gang switching is available as described in item 2.
NOTE: The position of the key-activated switch on the chassis front panel affects only
local switching. The position is disregarded for all remote switching. Interconnected
chassis will follow the key position of the chassis that is initiating the local switching.
Connecting Power Module SM514-A-PS or SM514-A-PS-E to “12VAC1”
connector will power the SM500A chassis and illuminate the PS1 LED on the
chassis front panel.
Connecting Power Module SM514-A-PS or SM514-A-PS-E to “12VAC2”
connector will power the SM500A chassis and illuminate the PS2 LED on the
chassis front panel.
If power redundancy is needed, two Power Modules can be connected or the
AC Redundant Power Supply (SM537) can be used.
SM532-C
Power Supply/Control Card, -48VDC. Same as SM531-C, but powered from
an external -48VDC using the “-48VDC” connector. The PS1 LED on
SM500A chassis front panel is illuminated when card is powered.
SM533-C
Advanced Control Card, 12VAC. Provides local control as SM531-C with
addition of SNMP, Telnet, Web browser and RS-232 control. A GUI based
software (SM540A) can be also used with the Advanced Control Card.
Note that the COM1 port is a DCE configuration. Pin 2 is TDX, pin 3 is RDX,
pin 5 is SIG GND. All other pins are not used. COM2 port is not used.
SM534-C
Advanced Control Card, -48 VDC. Same as SM533-C, except for -48VDC.
NOTE: Control Cards SM532-C and SM534-C are protected from overload by an internal
fuse.
Figure 2.2a. Pin assignments for COM1 (DB9 female)
