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The SSPA subsystem units can also be accessed directly through a packet wrapping
technique described in
Section 7.3
.
Serial protocol format is set at no parity, 8 bit with 1 stop bit. Baud rate is selectable
through the front panel.
If using a Terminal mode protocol, the SSPA provides remote menu access through a
HyperTerminal program or through an actual hardware terminal.
The Ethernet interface is fixed to the 10Base-T standard. Normally, straight-through
CAT5 cable is used to connect the SSPA to a network hub, and crossover CAT5 is
used to connect directly to a computer’s Ethernet port.
7.1 Remote Control - Parallel
7.1.1 Control Outputs
The hardware behind the form C relay is a single pole, double throw relay. Under
normal operation (no alarms) the relays are in an energized state. When a fault occurs
or the controller is powered off, the relays are in a de-energized state. The relay
contacts are capable of handling a maximum of 30 VDC @ 1A . The form C relay is
shown schematically in
Figure 7-2
. The form C relay contact outputs are listed in
Table 2-2
.
Common
Relay Energized
Closed on Fault
Open on Fault
Common
Relay de-Energized
Closed on Fault
Open on Fault
Figure 7-2: Parallel I/O Form C Relay
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