22
QB Series Operation Manual
The balance can be controlled by transmitting commands from an external device and is independent of the
timing on the device due to the full duplex nature of the interface. If the command is properly received, the
balance transmits acknowledgement (ACK, code 06H). If the command is unacceptable, the balance transmits
non-acceptance (NAK, code 15H).
In the conventional display weighing mode (non-counting mode), the device responds with ACK or NAK within
one second of receipt of command.
When transmitting function code changes, such as unit of measure, conditional response parameter, or
calibration commands, ACK or NAK are transmitted after completion of the requested command process (e.g.,
when the new parameter has been set and confirmed). Commands that are sent before ACK or NAK are
transmitted from the device are ignored.
Input format command consists of four (4) words, including terminators (CR=0DH or LF=0AH) as follows:
External tare command is as follows:
sp
g
gram
g
c
t
carat
ct
o
z
ounce
oz
o
t
troy ounce
ozt
g
g
grain
gr
Conditional Response Parameter For Comparator Function
(S1 = 1 word)
S1
Code
Contents
l
4CH
Low (under)
g
47H
Good (accept)
h
48H
High (over)
Table 5-8. Conditional Response Parameter for Comparator Function
Status of Data
(S2 = 1 word)
S2
Code
Contents
s
53H
Data stabilized
u
55H
Data unstabilized
e
45H
Erroneous data; all data unreliable except S2 (device
display reads either “o-Err” or “u-Err”)
Table 5-9. Input Command, Data Reception
1
2
3
4
C1
C2
CR
LF
C1
C2
CODE
Contents
T
sp
54h 20H
Tare Command
Units
(U1, U2 = 2 words, based on ASCII codes)
Table 5-7. Units (Continued)
