TruSat Technical Reference Manual
4–8
4.5 Alarm annunciation
The TruSat Trend Download board (RS-232) is equipped with an alarm annunciation
capability for use with your existing “nurse call” system. If the Trend Download board is
installed in your monitor, you must do the following to use this feature:
• Customize a cable in order to connect the monitor to your system.
• Change a switch setting on the Trend Download board to enable the feature.
Customizing a cable
The Trend Download board contains a relay contact connected across two pins of the
RS-232 DIN 6 circular connector. During an alarm event, the relay switch closes the
circuit between these two pins. This closed relay contact is rated to 0.5 A and 200 VAC.
You can access the two sides of the relay contact through the DIN 6 connector or the
DB9 connector on the TruSat/PC RS-232 cable (supplied with the Trend Download
upgrade) or on the TruSat/serial printer cable (supplied with the optional printer).
• DIN 6 connector—Connect to pins 1 and 3 using either cable.
• DB9 connector—Connect to pins 5 and 9 using either cable.
DIN 6 (both cables) DB9 on TruSat/PC RS-232 cable
6050-0006-924
DB9 on TruSat/serial printer cable
6050-0006-925
Male DIN 6 – Front view Female DB9 – Front view Male DB9 – Front view
Pin 1: Alarm event output
Pin 2: Transmit
Pin 3: Ground
Pin 4: Ready to send (RTS)
Pin 5: Clear to send (CTS)
Pin 6: Receive
Pin 1: Unused
Pin 2: Receive
Pin 3: Transmit
Pin 4: Data terminal ready (DTR) *
Pin 5: Ground
Pin 6: Data set ready (DSR) *
Pin 7: Ready to send (RTS)
Pin 8: Clear to send (CTS)
Pin 9: Alarm event output
Pin 1: Unused
Pin 2: Transmit
Pin 3: Receive
Pin 4: Data terminal ready (DTR) *
Pin 5: Ground
Pin 6: Data set ready (DSR) *
Pin 7: Clear to send (CTS)
Pin 8: Ready to send (RTS)
Pin 9: Alarm event output
* Pin 4 is tied to pin 6 (shorted together) on the DB9 connector.
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