BenchMark 320/BM470 Marking System
34753A 9 of 10
Extended Protocol. This protocol selection includes error checking and transmission acknowledgment. It
should be used in applications where serial communication is a vital part of the marking operation. All
communications are carried out in a parent/child relationship with the host being the parent. Only the host
can initiate communications. If the host does not receive a response within three seconds, it should retransmit
its original message. If no response is received after three tries, it should declare the link to be down.
The Extended Protocol message format as sent from the host to the BM470 controller is described below.
SOH TYPE [##] STX [DATA] ETX BCC CR
where:
SOH ASCII Start of Header character (001H). The
controller ignores all characters received prior to
the SOH.
TYPE A single, printable ASCII character that defines
the meaning (type) and content of the message
downloaded from the host, where:
1 Message Type 1 overwrites a specific field in
currently loaded pattern with data supplied in
the host message. See [DATA] for details.
G Message Type G initiates a print cycle to
mark the currently loaded pattern.
I Message Type I requests the marker return
the status of standard output and input
signals. The system will return a hexadecimal
code for the 6 output signals and 12 input
signals in the following format:
OO;III
where:
bit 1 READY 0x01
bit 2 DONE 0x02
bit 3 PAUSED 0x04
bit 4 NO_FAULT 0x08
bit 5 SPARE_1 0x10
bit 6 SPARE_2 0x20
bit 1 START 0x001
bit 2 STOP 0x002
bit 3 SEL_0 0x004
bit 4 SEL_1 0x008
bit 5 SEL_2 0x010
bit 6 SEL_3 0x020
bit 7 SEL_6* 0x040
bit 8 SEL_4 0x080
bit 9 SEL_5 0x100
bit 10 SPARE_1 0x200
bit 11 SPARE_2 0x400
bit 12 SPARE_3 0x800
*Input SEL_6 can be configured
to place the machine online (default) or
to remotely select a pattern.
O Message Type O resets the marker and
places it online.
P Message Type P specifies the pattern name
to be loaded for printing. See [DATA].
Q Message Type Q updates a specific query
buffer with data supplied in the host
message. See [DATA].
V Message Type V updates the variable text in
a specific text field of the currently loaded
pattern with data supplied in the host
message. See [DATA].
[##] Optional two-digit ASCII number that specifies
the Station ID of the controller when used in
multi-drop network applications. The Station ID
may range from 00-31. Note “00” is reserved for
applications where only one controller is used. In
such applications, this field can be eliminated and
“00” will be assumed.
STX ASCII Start of Text Character (002H).
[DATA] Optional character string that may be required for
certain message types (for example, Type 1, P,
Q, and V).
Data is typically sent in the format:
nn<string>.
where:
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.
ETX ASCII end of text character (003H).
BCC Optional Block Check Code that is generated and
sent to improve link reliability by providing fault
detection. The BCC is calculated by taking an
eight-bit addition of the TYPE and DATA TEXT
characters and transmitting them as a three-digit
ASCII decimal number in the range from 000 to
255. If the sum is greater than 255, the most
significant bit overflows and is discarded.
CR ASCII Carriage Return Character (00DH).
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