Honeywell Mini-AT User Manual

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Page 30
Mini-AT User Guide
Serial Connector
The Mini-AT’s serial connector permits data transfer to or from the instrument's on-board memory. Any
RS-232 serial device can be connected to the instrument's serial port, but the serial device must be able
to communicate using Mercury's serial data protocol.
Modem operation, as well as local serial connections, are supported by MasterLink32 and Mini-AT Link
software. All other third-party software and RS-232 devices (such as Automatic Meter Reader
equipment) require Mercury Serial Data Protocol to be incorporated into the communication drivers.
Refer to figure 9 below when making connections to the local RS-232 serial port. The I/O cable (p/n 40-1629)
incorporates alignment tabs and a locking ring. Align the widest tab to the top and push connector into the port
as far as it will go. Turn the outer locking ring clockwise to lock the cable in place. Locate the serial port on
the laptop computer, it may be labeled COM1, COM2, RS-232 or just Serial. Connect the I/O cable DB-9
connector to the laptop computer serial port. The MasterLink 32 and Mini-AT Link Software Help Screens
contain information about operating MasterLink32 and Mini-AT Link software.
LCD Diagnostic Function (Linking)
Beginning with firmware version 6.5121, the Mini-AT will display additional characters on the LCD to let the
user know the status of the serial link. Examples are below.
Display Description
vvvvvvvv Normal numeric display when not linked (default is corrected volume total)
LLLLLLLL Instrument has awakened due to serial activity.
Lbbb_005 Instrument is attempting to link. ‘bbb’ is the Mini-AT baud ratesetting at item 126.
(Useful for matching instrument and computer baud rates.) ‘005’ indicates protocol
character ‘ENQ’ received when the baud rates of the Mini-AT and computer match.
LLvvvvvv Instrument is linked, ‘vvvvvv’ is the last six digits of normal display
Fig. 9
Serial Connection to Mini-AT
RS-232 Port
Back View
Serial Port
(i.e.COM1, COM2,)
I/O Cable
P/N 40-1629
Pressure Connector
Plug for future
expansion
Laptop Computer
Mini-AT
Optional 2nd
Pressure Port
Warning: Connections to the RS-232 port are
permitted only in non-hazardous locations

Honeywell Mini-AT Specifications

General

Brand	Honeywell
Model	Mini-AT
Category	Controller
Language	English