Synchronization and Data Output Parameters
Definition
During data communication between the balance and an on-line device
(computer), “telegram-style” information consisting of ASCII characters is transmitted
by the interface.
For error-free data communication, the interface parameters including
the baud rate, parity and handshake mode, as well as the character format,
must be the same for both units.
You can change these parameters in the balance operating menu so that they
match those of the on-line device.
In addition to these parameter settings, you can define the data output
parameter of the balance so that data are transmitted depending on various
conditions – for more information, see “Utilities” in Part 2.
If you do not plug a peripheral into the interface port on the balance, this will not
generate an error message. In this case, data will be output but not received.
Handshake
The balance interface (Sartorius Balance Interface = SBI) has a 23-byte transmit
buffer and a 40-byte receive buffer.
You can access the balance operating menu to define various handshake
parameters:
Software handshake: controlled by “XOFF” and “XON”
Hardware handshake: – send 2 characters after “CTS”
– send 1 character after “CTS”
What happens when you define a software handshake?
Receiving device:
“XOFF” will not be transmitted until the receive buffer has stored the 26th character.
The enable command “XON” is given after the buffer has transmitted all characters
up to the 14th character.
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