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208143 REV C
Operations Manual, HPA3, Mini Compact Outdoor SSPA
2.2.4.1 Alarms on J4
A variety of alarm signals are present at the M&C connector, J4. Both Form-C relays and
open collector outputs are available.
2.2.4.1.1 Summary Alarm (J4) Form C Contacts
The Summary Alarm is accessible in both Form C relay and open collector format. The
Form C relay is “energized” under normal operating conditions and “de-energized”
when a Fault condition exists.
2.2.4.1.2 Auxiliary Alarm (J4) Form C Contacts
The Auxiliary Alarm relay is an end user alarm that can be used to signal an alarm
condition that is dependent on the state of the Auxiliary Input (J4-Pin P).
The Auxiliary Input is a contact closure to ground. When this input is pulled to ground
the Auxiliary Alarm relay is energized (Normal State). When the Auxiliary Input is open
circuited the Auxiliary Alarm relay is de-energized (Alarm State).
2.2.4.1.3 Open Collector Alarm Outputs (J4)
The open collector alarm outputs will require external pull-up resistors (unless
connected to the Auxiliary Input). They are capable of sinking up to 20mA current at 30
VDC. The open collector outputs are pulled to ground under normal operating condi-
tions and switch to high impedance state during an alarm condition.
•
Auxiliary Alarm: follows state of Auxiliary Input as described above
2.2.4.2 Serial I/O Control (J4)
For serial data control of the Mini Compact Outdoor SSPA, a Windows-based Monitor
&Control program is supplied with the amplifier that allows all of the control and alarm func-
tionality over a serial communication link.
Both RS-232 and RS-485 can be used to communicate with the amplifier. The amplifier
default is to operate on RS-485 but can easily be set to RS-232 by pulling the RS-232/
RS-485 Select line low. This is done by connecting J4-Pin D to J4-Pin V.
The Mini Compact Outdoor Amplifier may be supplied with a Quick Start Cable in which this
connection is already made. This allows the user to quickly setup the amplifier and verify its
operation. The other side of the cable has a 9-Pin female D connector that mates with most
notebook and desktop personal computers.
Communication links using RS-232 are typically good up to 30 ft. (9 m) in length. Installations
exceeding this length can use the RS-485 mode which will allow serial control up to 4000 ft.
(1200 m).