USA Measurements US-4011, Руководство пользователя и техническое руководство

Страница: 34 / 42

US-4011 .
31 .
8. Details about Serial Communication:
8.1. COM1 is RS232, communication wires come from RS232 connector, and TXD0, RXD0 and GND are used. Please
refer to section 10 connector details
8.2. COM2 is USB used as a virtual RS232, communication wires come from USB connector, and TXD1 , RXD1 and GND
are used, Please refer to section 10 for connector details.
8.3. The baud rate and byte format is set by
USER-COM1
/
2-BAUD.RT
and
USER-COM1
/
2-BYT.FMT
. Responses to
serial commands will be immediate, or within one weight measure cycle of the scale. One second should be
adequate for use as a time-out value by remote (controlling) device.
8.4. The length of each item in a transition string:
8.4.1. Reading data --- 6bytes
Data polarity ----1byte: “-” for negative, and followed by the first digit; “ ” for positive.
Decimal point ---1byte: “.”
Measure unit ----1-5bytes:“ lb”,“ kg”, “lb:oz”, “pcs”, “%”, Units are always lower case, left aligned
Current status-- 4bytes
8.4.2. If the weight is overcapacity, the scale will return eight “^” characters (the field of polarity, decimal
point, weight data is filled by “^”).
8.4.3. If the weight is under capacity, it will return eight “_” characters (the field of polarity, decimal point, and
weight data is filled by “_”).
8.4.4. If the zero point is error, it will return eight “-“ characters (the field of polarity, decimal point, and
weight data is filled by “-”).
8.4.5. Useless leading 0 before digits is suppressed. Reading weight is right aligned.
8.5. Key to symbols used
<LF> Line Feed character (hex 0AH)
<CR> Carriage Return character (hex 0DH)
<ETX> End of Text character (hex 03H)
<SP> Space (hex 20H)
H
1
H
2
H
3
H
4
Four current status bytes
<P>
Polarity character: “
－
” or “ ”
W
1
---W
6
Reading data, 1-6 bytes (six digits)
<DP> Decimal point
U
1
U
2
U
3
U
4
U
5
Measure units, kg, lb, lb:oz , % or pcs; 2-5 bytes
<Add> Address of scale; 2 bytes (00-99)
<Prompt> Prompt characters of output content; max. 11bytes
The bit definition of H
1
H
2
H
3
H
4
:
Bit Byte 1 (H1) Byte 2 (H2) Byte 3 (H3) Byte 4 (H4)
0
0=stable 0= not under capacity 00=compare disable
01=lower limit
10=ok
11=upper limit
00=normal weighing
01=count weighing
10=percent weighing
11=other mode
1= not stable 1= under capacity
1
0= not at zero point 0= not over capacity
1= at zero point 1= over capacity
2
0=RAM ok 0=ROM ok 0= gross weight 0=not in HOLD
1= RAM error 1=ROM error 1= net weight 1=in HOLD
3
0= eeprom OK 0=calibration ok 0=initial zero ok 0=battery ok
1= eeprom error 1=calibration error 1=initial zero error 1=low battery
4 always 1 always 1 always 1 always 1
5 always 1 always 1 always 1 always 1
6 always 0 always 1 always 1 always 0
7 parity Parity Parity Parity