Motorola MVME1603, Инструкция по установке и эксплуатации, Страница: 195 / 222

Serial Interconnections
C-5
C
The MVME1603/MVME1604 conforms to EIA-232-D specifications.
Note that although the EIA-232-D standard recommends the use of short
interconnection cables not more than 50 feet (15m) in length, longer cables
are permissible provided the total load capacitance measured at the
interface point and including signal terminator does not exceed 2500pF.
EIA-530 Connections
The EIA-530 interface complements the EIA-232-D interface in function.
The EIA-530 standard defines the mechanical aspects of this interface,
which is used for transmission of serial binary data, both synchronous and
Table C-3. EIA-232-D Interface Transmitter Characteristics
Parameter
Value
Unit
Minimum Maximum
Output voltage (with load resistance of 3000
Ω
to
7000
Ω
)
±
8.5 V
Open circuit output voltage
±
12 V
Short circuit output current (to ground or any other
interconnection cable conductor)
±
100 mA
Power-off output resistance 300 W
Output transition time (for a transition region of -
3V to +3V and with total load capacitance, includ-
ing connection cable, of less than 2500pF)
2
µ
s
Open circuit slew rate 30 V/
µ
s
Table C-4. EIA-232-D Interface Receiver Characteristics
Parameter
Value
Unit
Minimum Maximum
Input signal voltage
±
25 V
Input high threshold voltage
2.25
V
Input low threshold voltage 0.75 V
Input hysteresis 1.0 V
Input impedance (
−
15V < V
in
< +15V) 3000 7000
Ω