Parr Instrument 6300 - Manual (Page 81)

C
OMMUNICATIONS
I
NTERFACES
6300
D
w w w . p a r r i n s t . c o m 81
A
PPENDIX
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C
OMMUNICATIONS
I
NTERFACES
USB P
ORT
USB Connection
The 6300 Calorimeter is equipped with a USB port for
connection to either a 40 or 80 column printer and/or a
computer.
The default parameters for the 6300 Calorimeter are set
up for use with the Parr 1758 Printer.
B
ALANCE AND
P
ORT
I
NPUT
D
RIVER
S
PECIFICATIONS
The 6300 Calorimeter supports input from 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
field. The number of data characters indicated for each
of the drivers, below, are default values. This feature vir-
tually 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 determined
by logging the balance output to the printer attached to
the calorimeter. Those protocols which send a com-
mand string to the balance 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 calorimeter must be correctly wired or
configured. In addition, the specifics of the data frame,
such as the baud rate, # of data bits, parity, # of stop
bits and handshaking (if used) must be the same for
both the balance and the calorimeter.
M
ETTLER
011/012 B
ALANCE
I
NTERFACE
Field Length
ID 2
space 1
data 9
space 1
g 1
CR 1
LF 1
The ID field must contain “S_” to indicate a stable
mass. The data field contains the current mass, right
justified, with a decimal point. The balance should be
configured to send continuously.
S
ARTORIUS
B
ALANCE
I
NTERFACE
Field Length
polarity 1
space 1
data 8
space 1
stability 2
CR 1
LF 1
The polarity field must contain either a “+” or a space.
Leading zeros in the data field are blanked, except for
the one to the left of the decimal point. The stability
field must contain “g_” for the calorimeter to accept
a mass. The balance should be configured to transmit
data upon receipt of the following command string:
[ESC] P [CR] [LF]
Note:
The automatic data output option should not be used.
The calorimeter will send this command string once ev-
ery 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. Howev-
er, unstable readings will be rejected and a warning will
be issued. Acknowledging the warning by pressing the
CLEAR ENTRY key will re-issue the command string
to the balance on a periodic basis.