BenchMark 320/BM470 Marking System
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Host Communications
The BM470+ Enhanced Communications software allows you to configure the RS-232 parameters for the
Comm port.
The serial interface is most often used to connect a host computer, a data terminal, or a barcode scanner.
The serial data character format for all transmissions to and from the BM470 controller is:
· Asynchronous
· 1200, 2400, 4800, 9600, 19200, 38400, or 115200 Baud
· 1 or 2 Stop Bits
· 7 or 8 Data Bits
· None, Even, or Odd Parity
In addition to defining Comm port communication parameters, you can select Extended Protocol or
Programmable Protocol.
Programmable Protocol. Use this protocol when very simple one-way communications are required, such
as with barcode scanners. Programmable Protocol provides no error checking or acknowledgment of the
transmitted data. Note XON/XOFF Protocol applies even when Programmable Protocol is selected.
Starting Character specifies where the software begins to count character positions. This number must
be entered in decimal format (for example, "2" for the ASCII Start of Text "STX").
Terminating Character identifies the end of the transmitted string (usually "13" for the ASCII carriage
return character).
Character Position counts from the starting character and ignores all characters preceding it.
Character Length accepts variable-length messages (if set to 0) or messages of a pre-specified, fixed
number of characters.
Ignore Character identifies the character to ignore when sent from the host (usually "10" for the ASCII
line feed character).
Message Type allows message-type recognition, which defines how the marking system uses data it
receives from the host.
1 Message type 1 overwrites the first line of the first text field with data extracted from the host
P Message type P loads a specific pattern identified by data extracted from host
Q Message type Q updates the text in the first query buffer with data extracted from the host
V Message type V updates the first variable text flag found in the pattern with data extracted from the host
0 Message type 0 (zero) indicates the host will provide message type, field number (if applicable), line number (if
applicable), and data; delegates message type selection to the host on a message-by-message basis. The host
message must use the format:
Tnn<string>
where:
T = 1, P, Q, or V to indicate message type
nn = two-digit field number or query text buffer where data will be placed.
Note: Not used with Message Type P.
<string> = For Message Type P, indicates the pattern name to be loaded.
For Message Types 1, Q, or V, indicates the data to be inserted into the field or the query text
buffer.
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