GSE Scale Systems - 111
Chapter 15 Communications Technical Reference Manual
Chapter 15 Communications
15.1 Communication Protocol Parameter
Setup
P200.XX Baud
This parameter determines the baud rate that will be used
by the Print and Comm Ports. The baud rate specifies the
rate at which characters are transmitted and received in
terms of bits per second. The selections range from 150
to 19,200 baud.
P201.XX #data
This parameter will set the number of data bits for the
transmission to either 7 or 8 (if 7 bits is selected, then
extended ASCII codes, those greater than decimal 127,
will not be transmitted from the 574).
P202.XX Par'y
This parameter sets the parity of the transmission to
none, even or odd.
P203.XX #stop
This parameter sets the number of stop bits to 1 or 2. The
number of stop bits has an affect only on outgoing
transmissions. As long as incoming transmissions have
at least 1 stop bit, the instrument will correctly receive
data.
P204.XX ComHS
This parameter sets the handshake for the Comm Port to
none, CTS (hardware), XON (software) or both. This
setting applies to transmissions sent and received by the
574.
P205.XX PrnHS
This parameter sets the handshake for the printer port to
none or CTS (hardware).
P206.XX
RxCom enables or disables the RS232 receiver for
accepting communications through the Comm Port.
P207.XX TxRTZ
This parameter sets a return range for use when you elect
to transmit once per weighment and is only meaningful if
the "wghmt" selection is made in parameter P210, P220,
P230 or P240. After the applied weight exceeds the
percentage of Full Scale specified by P207, a
transmission will take place as soon as motion ceases,
regardless of the motion selections made in P212, P222,
P232 or P242. Before a second transmission can take
place, the GROSS Weight must fall below this threshold.
If the 100% selection is made, then one transmission will
take place every time motion ceases, as long as the Gross
Weight is not within ±2 divisions of zero. Note that
motion is defined by parameters P114 and P115.
P208.XX Width
This parameter sets the number of characters (0 through
15) that are transmitted for numeric parameters if a fixed
width format is used within the Custom Transmit. If
more characters than specified by this parameter are
needed to represent the data being sent, then more
characters will be sent.
P209.XX TxHld
This parameter lets you select whether a transmission
will be held up or aborted when the transmit out buffer
becomes full. Some explanation of the transmission
routine of the 574 may help determine your selection
here: There are two transmit buffers in the 574, one for
the Print Port and one for the Comm Port. Each is 256
bytes in size. The instrument places the data to be
transmitted into the appropriate transmit buffer. As soon
as this happens, the transmission of data begins. If the
entire transmission will not fit into the buffer, the
instrument will check the selection for this parameter. If
the selection is "hold", then the instrument will wait for
additional room to become available in the buffer so that
it may resume filling the buffer. If no space is made
available within two seconds, then the warning message
"tx on hold" will be displayed until buffer space becomes
available. At this time the message "tx cont'd" will be
displayed. If the <CLR> key is pressed, the
transmission will be aborted. During the time that the
instrument is attempting to fill the buffer with data to
SECTION - 15.1
NOTE:
Since P200 to P208 establish the communications
protocol for both the Print and Comm Ports. Make
sure that all peripheral devices which you connect
to the 574 are set to the same selected baud rate.
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