Parr Instrument 6200 - Manual (Page 61)

Communications Interfaces
6200 D
w w w . p a r r i n s t . c o m 59
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PPendix
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Communications Interfaces
Printer Port
USB Connection
The 6200 Calorimeter is also equipped with a USB
port for connection to either a 40 or 80 column
printer and/or a computer.
The default parameters for the 6200 Calorimeter are
set up for use with the Parr 1758 Printer.
Balance and Port Input Driver Specifications
The 6200 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 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 intro-
duced.
The format of an unknown balance can be deter-
mined by logging the balance output to the printer
attached to the calorimeter. Those protocols which
send a command 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 calo-
rimeter 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.
Mettler 011/012 Balance Interface
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.
Sartorius Balance Interface
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 calorim-
eter to accept a mass. The balance should be config-
ured 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
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. However, unstable readings will be re-
jected 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.