Hyundai Yanmar TNV Series Manual page 52

Figure 2-19 illustrates the voltage levels at the input terminal for the low-side contact input. When the switch turns
on, the input terminal goes low for the switch with NO contact and goes high for the switch with NC contact.
Contact input
SW=OFF→High （ 0）
(a) Normally open switch input
Unless otherwise specified, this manual assumes that switches with NO contact are used. This means that
turning on the switch activates the corresponding function.
Selection of NO switch or NC switch is allowed by using mapping plug-ins. Table 2-15 lists contact input
terminals for which a NO or NC switch can be selected.
Contact output
There are two schemes for contact output of the E-ECU: High-side output and Low-side output. See
Figure 2-20 See Table 2-3 for the allowable sink current and source current of the contact outputs.
In this manual, output transistor ON is referred to as logical "1" and output transistor OFF as logical "0". In
the high-side output scheme, the output terminal goes high when the transistor turns off. In the low-side
output scheme, the output terminal goes low when the transistor turns off.
Tr.=OFF→High(0)
(a) High-side contact output
TNV Application Manual
ECU
VB
1.2k
Source
current
10mA
SW=ON→Low （1）
Figure 2-19 Switches for low-side contact input
ECU
VB
Sink
Tr.=ON→Low(1)
Figure 2-20 Contact output schemes and output logics
ECU
Contact input
SW=OFF→Low （0）
(b) Normally close switch input
ECU
load
Contact output
Tr.=OFF→Low(0)
(b) Low-side contact output
CONTROL SYSTEM
VB
1.2k
Source
current
10mA
SW=ON→High （ 1）
VB
Source
load
Tr.=ON→High(1)
2-33