BenchMark
®
200/BM470 Marking System
8 of 8
34743A
BM470+ ENHANCED COMMUNICATIONS
(continued)
Host Communications
(continued)
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 has the ability to initiate communications. If the host does not receive a response within three seconds, it
should re-transmit its original message. If no response is received after three tries, it should declare the link to be down.
The following describes the Extended Protocol message format as
sent from the host to the BM470 controller.
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.
P
Message Type P specifies the pattern name to be
loaded for printing. See [DATA] for details.
Q
Message Type Q updates a specific query buffer
with data supplied in the host message.
See [DATA] for details.
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] for details.
O
Message Type O resets marker and places it online
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:
O O ; I I I
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
Note: Input SEL_6 may be configured
to place machine online (default)
or for Remote Pattern Selection.
[##]
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
that “00” is reserved for applications where only one
controller is used. In such applications, this field may 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 (e.g., Type 1, P, Q, and V).
Typically, data is 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, as applicable.
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).
TRADEMARKS
Telesis
and
BenchMark
are registered trademarks of
Telesis Technologies, Inc. in the United States.
