Synchronization and Data Output Parameters
Definition
During data communication between the scale 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 scale 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 scale so that data are transmitted depending on various conditions – see
“Utilities for Printouts or Data Transfer”.
If you do not plug a peripheral device into the interface port on the scale, this will
not generate an error message. In this case, data will be output but not received.
Handshake
The scale interface (Sartorius Balance Interface = SBI) has a 23-byte transmit buffer
and a 40-byte receive buffer
You can access the scale operating menu to define various handshake parameters:
Software handshake: controlled by “XOFF” and “XON”
Hardware handshake: after “CTS” send 2 characters
after “CTS” send 1 character
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 the14th character.
If the device addressed does not understand the control command, the
receiving device continues to operate additionally with a hardware handshake
after it has received another 6 characters.
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