Parr Instrument 6755 - Manual (Page 30)

8
Accessory Connections
P a r r I n s t r u m e n t C o m p a n y 28
C
HAPTER
8
Accessory Connections
Communication Connection
There is a USB connection on the rear of the 6772 to
facilitate printer and balance connections.
The 6772 will allow the user to specify the IP ad-
dresses of one or more Balance Interface devices on
the network by selecting the Network Data Device
menu in the Communications Controls menu. Bal-
ance Interface devices are polled from device 1 to 15
for sample and / or spike weights when the weight
entry mode is set to Network.
Printer Connections
The printer type setting is on the Communication
Controls Menu. The default parameters for the 6772
Calorimetric Thermometer are set up for use with
the Parr 1758 Printer.
Balance Connections
The 6772 Calorimetric Thermometer supports input
from the multiple balance types. Additionally, a
generic input driver is provided for communications
with balances that do not conform to the supported
protocols. A new feature supported by all balance
input drivers is the ability to change the expected
number of characters in the data fi eld. The number
of data characters, indicated for each of the driv-
ers below, are default values. This feature virtually
eliminates the need for balance input drivers to be
re-written in the event the balance manufacturer
elects to alter the output string of a balance when
new models are introduced.
The format of an unknown balance can be deter-
mined by logging the balance output to the printer
attached to the Calorimetric Thermometer. Those
protocols which send a command string to the bal-
ance will do so while logging is active. In order for
the logging to produce meaningful results, the cable
connecting the balance to the balance input port
of the Calorimetric Thermometer must be correctly
wired or confi gured. In addition, the specifi cs of the
data frame, such as the baud rate, # of data bits, par-
ity, # of stop bits and handshaking (if used) must be
the same for both the balance and the Calorimetric
Thermometer.
Mettler 011/012 Interface
The ID fi eld must contain
“S_” to indicate a stable
mass. The data fi eld contains
the current mass, right justi-
fi ed, with a decimal point. The
balance should be confi gured
to send continuously.
Sartorious Interface
The polarity fi eld must contain either a “+” or a
space. Leading zeros in the data fi eld are blanked,
except for the one to the left of
the decimal point. The stabil-
ity fi eld must contain “g_” for
the Calorimetric Thermometer
to accept a mass. The balance
should be confi gured to trans-
mit data upon receipt of the
following command string:
[ESC] P [CR] [LF]
Note: The automatic data
output option should not be used.
The Calorimetric Thermometer will send this com-
mand string once every few seconds after the
ENTER key has been pressed during a mass entry
sequence. The ENTER key should only be pressed
when the mass reading is stable.
Generic Interface
The data fi eld should consist
of 9 numeric characters (0
through 9, +, - and space) ter-
minated with a carriage return
(CR). Leading zeros may be blanked as spaces and
are counted. Non-numeric characters are ignored
and will reset the input buffer if the data fi eld has
not been fi lled. Any characters received after fi ll-
ing the data fi eld and before the carriage return are
ignored.
Field Length
ID 2
space 1
data 9
space 1
g 1
CR 1
LF 1
Field Length
polarity 1
space 1
data 8
space 1
stability 2
CR 1
LF 1
Field Length
data 8
CR 1