Black Box Data Alarm SW705A Manual page 6

Your Data Alarm alerts your personnel to abnormal
conditions by providing AC power to another device (such
as an alarm light, bell, or buzzer) when data from a third
device (such as a sensor, computer, or intelligent shop-
floor machine) starts flowing through the Alarm on its way
to a fourth device (such as a printer or modem). You can
install the alarm directly into the cable path that you want
it to monitor. Figure 2-1 on the next page shows a typical
application.
Data Alarms are currently available in three versions: The
RS-232 Data Alarm (SW705A) monitors the Transmitted
Data (TD) and Receive Data (RD) leads on a serial RS-232
line; the Parallel Data Alarm (SW706A) monitors the
STROBE lead on a parallel line; and the RS-422 Data
Alarm monitors the Transmitted Data (TD) lead on a
serial RS-422 line pinned to the RS-530 specification.
(If you are using a different type of interface, or if your
application requires the Data Alarm to react to the absence
rather than the presence of data, call your supplier for
technical support. They might be able to give you a
quote on a custom unit.)
If you want the Data Alarm to switch dry contacts instead
of AC power, you can easily select this function by rewiring
the terminal strip inside the Alarm. See Section 3.2.
2. Introduction
CHAPTER 2: Introduction
3