13
Using External Contact Input
When 1 pin and 3 pin or 1 pin and 2 pin of lead wire of optional foot switch (AX
-
SW137
-
PRINT, AX
-
SW137
-
RE-ZERO) is shorted 100 ms or longer, it can be operated the same as
the PRINT key and RE-ZERO key on the panel.
RS-232C connection diagram
6.2.
Using the Comparator Output
This option can output results of the 3
-
stage comparison or 5
-
stage comparison that is
specified at "Comparison method (
)" in the function table of the balance.
Comparison results are displayed using HI
, OK
, LO and are output using contacts of
I
/
O terminals. Comparison tolerance ranges are the following 3 types and they can be
specified at "Comparator mode ( )" in the function table.
"No comparison", "Comparison when stable value or overloaded", or "Comparison always"
The range of near zero can is specified at "Near zero (
)" in the function table.
There are two types of comparison method. One is the method using second upper limit, upper
limit, lower limit and second lower limit. Another is the method using center value and tolerance
range. There two types of input methods for second upper limit, upper limit, lower limit and
second lower limit. One is the numerical input. Another is the input using sample weight.
Balance can sound a buzzer according to the comparison result. That can be specified at
"Comparator buzzer (
)" in the function table.
Caution
When weighing value is not displayed in performing RE-ZERO, etc., READY contact becomes
"open". When weighing value is displayed, READY contact becomes "short".
3-stage comparison result
3-stage comparison - display, contact output
Weighing value
Result
Display
Contact output Buzzer
Threshold value Formula
HI OK LO
UL
LL
UL < WV
HI HI illuminated Short
Open
LL
≤
WV
≤
UL
OK OK illuminated
Short
WV < LL
LO LO illuminated Open
Short
Weighing value
:
WV, Upper limit
:
UL, Lower limit
:
LL
2
3
7
8
6
5
TXD
RXD
RTS
CTS
DSR
SG
RXD
TXD
RTS
CTS
DSR
SG
Balance (DCE)
PC side (DTE)
Inside the balance
PC terminal example
Approx. 5V
Straight cable
