Appendix A: External communications
74 LaserSense HSSD-2 Aspirating Smoke Detector Installers Handbook
BMS protocols on the detector command module
The command module of the detector has a second RS-232 port that can be
used to send messages to a pager or compatible GSM phone using a modem, or
to enable connection to a Building Management System (BMS). This comprises
the terminals “RS 232 Tx” (transmit), “RS 232 Rx” (receive), and “GND” on the
green terminal block inside the unit.
The set-up of the command module uses three functions:
• BMS protocol
• Page on fault
• Page on alarm
When either Page on fault or Page on alarm is enabled, the second serial port is
reserved exclusively for paging purposes by setting BMS protocol to 0 (TAP
paging).
The programmable function “BMS protocol” sets the communications format that
is used by the second serial port to communicate with the BMS. Setting BMS
protocol to anything other than 0 (Tap paging) will disable functions Page on fault
and Page on alarm if they are enabled.
Table 9: BMS protocols
Protocol
number
Protocol
0 TAP paging (default)
1 Output only. Events are sent in the same ASCII text format as the internal event
long display. This may be used to drive a serial printer if required.
2 BACnet ANSI/ASHRAE standard 135-1995
Text output support (protocol 1)
Text is output at 9600 baud, 8 bit with no parity. When an event occurs, the event
is printed in the following format:
Device “command module” or “Detector n”
Event “Fire 1”
Timedate 10:32 21/03/2001
BACNET support (protocol 2)
The command module models the attached detectors as analog value object
types instances 2 to 128. The command module status is stored as analog value
instance 1. The Present_Value property of the analog objects can have one of
the values shown in Table 10.
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