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Appendix F
Appendix F
PMS Multi-Drop Protocol (MiniLaz Emulation)
PMS Multi-Drop Protocol (MiniLaz Emulation)
This protocol is designed to be used
This protocol is designed to be used on an RS-485 ba
on an RS-485 based system, with multiple
sed system, with multiple
individually addressable instruments. All communications are polled with a
individually addressable instruments. All communications are polled with a
sensor address. The host program must take care of
sensor address. The host program must take care of querying the unit for data.
querying the unit for data.
RS-485 communications require an external
RS-485 communications require an external RS-232 to RS-485 converter. The
RS-232 to RS-485 converter. The
converter must support automatic send data control. Older con
converter must support automatic send data control. Older converters which
verters which
require CTS control (hardware
require CTS control (hardware flow control) will not work
flow control) will not work properly
properly..
T
Tested RS-232/RS-485
ested RS-232/RS-485 converters
converters
Both of these models have bee
Both of these models have been tested with the LASAIR II in MiniLaz
n tested with the LASAIR II in MiniLaz
emulation mode connected to Facility Net.
emulation mode connected to Facility Net.
NOTE:
NOTE:
A null modem is required to connect between these models and the
A null modem is required to connect between these models and the
LASAIR II.
LASAIR II.
••
RS-232 to RS-485 converter with automatic send-data control and
RS-232 to RS-485 converter with automatic send-data control and
opto-isolation: P/N 485OT9L
opto-isolation: P/N 485OT9L
••
RS-232 to RS-485 Converter with automatic send-data
RS-232 to RS-485 Converter with automatic send-data control and quick-
control and quick-
disconnect terminal block: P/N
disconnect terminal block: P/N 485PTBR
485PTBR
Both of the preceding models are
Both of the preceding models are available from:
available from:
B & B Electronics
B & B Electronics
707 Dayton Rd.
707 Dayton Rd.
P. O. Box 1040
P. O. Box 1040
Ottawa, IL 61350
Ottawa, IL 61350
Phone: (815) 433-5100
Phone: (815) 433-5100
Web: http://www.bb-elec.com
Web: http://www.bb-elec.com
Both models require external 12 VDC power
Both models require external 12 VDC power @100 mA. One solution is the
@100 mA. One solution is the
120 V
120 VAC to 12
AC to 12 VDC supply P/N 485PS
VDC supply P/N 485PS2.
2.
The LASAIR II provides an extended
The LASAIR II provides an extended version of the command set used in
version of the command set used in the
the
obsolete MiniLaz instrument, and
obsolete MiniLaz instrument, and offers backward compatibility
offers backward compatibility. This protocol
. This protocol
allows a LASAIR II to be a drop-in replacement for a MiniLaz on a Facility-
allows a LASAIR II to be a drop-in replacement for a MiniLaz on a Facility-
V
View
iew installation.
installation.