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1219 IH-8105
INTERFACE COMMANDS
The interface enables display and GMP data to be sent to a computer or printer. A computer can be used to control
some functions of the indicator using the commands listed below.
MT STANDARD CONTINUOUS OUTPUT
A checksum character can be enabled or disabled with continuous output. The data consists of 17 or 18 bytes as
shown in the standard continuous output.
Non-significant weight data and tare data digits are transmitted as spaces. The continuous output mode provides
compatibility with OHAUS products that require real-time weight data (the standard continuous output).
The table below shows the format for the standard continuous output.
Standard Continuous Output Format
Continuous Output Format Notes:
1. ASCII Start of Text character (02 hex), always transmitted.
2. Status bytes A, B and C. Refer to tables below for details of the structure.
3. Displayed weight. Either gross or net weight. Six digits, no decimal point or sign. Insignificant leading zeroes are
replaced with spaces.
4. Tare weight. Six digits of tare weight data. No decimal point in field.
5. ASCII Carriage Return <CR> character (0D hex).
6. Checksum, transmitted only if enabled in setup. Checksum is used to detect errors in the transmission of data.
Checksum is defined as the 2's complement of the seven low order bits of the binary sum of all characters
preceding the checksum character, including the <STX> and <CR> characters.
Tables below detail the status bytes for standard continuous output.
Status Byte A Bit Definitions
STATUS
2
INDICATED WEIGHT
3
TARE WEIGHT
4
Character
1
2
3
4
5
6
7
8
9
10
11
12 13 14 15
16
17
18
Data
STX
1
SB-A
SB-B
SB-C
MSD
–
–
–
–
LSD
MSD
–
–
–
–
LSD
CR
5
CHK
6
BITS 2, 1 AND 0
2
1
0
Decimal Point Location
0
0
0
XXXXX00
0
0
1
XXXXX0
0
1
0
XXXXXX
0
1
1
XXXXX.X
1
0
0
XXXX.XX
1
0
1
XXX.XXX
1
1
0
XX.XXXX
1
1
1
X.XXXXX
BITS 4 AND 3
4
3
Build Code
0
1
X1
1
0
X2
1
1
X5
BIT 5
Always = 1
BIT 6
Always = 0
SERIAL COMMUNICATION AND PRINTER SETUP CONTINUED