Parr Instrument 6200 - Manual (Page 70)

71
6200
Calorimeter Operating Instruction Manual
Printer
Port
Balance
Port
RS232C Connections
The 6200 Calorimeter is also equipped
with an RS232C port for connection to
either a 40 or 80 column printer and/or a
balance. Before making either of these
connections the data transmission rate of
the calorimeter and the printer or balance
must be matched. Generally the baud rates
on either device can
be changed to achieve this match. Printer
Port Communications for the 6200
Controller are on the Printer Port
Communications Page.
The default parameters for the 6200
Calorimeter are set up for use with the Parr
1757 Printer. Table D-1 on page D-3
identifies and describes the pin-out for the
RS232C port.
The 6200 Calorimeter supports
input from multiple balance types
indicated below. 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
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
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 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
.
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.
APPENDIX D COMMUNICATION INTERFACES
Mettler
011/012
Balance
Interface
D-1