EIA-232-D Connections
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B-5
B
Interface Characteristics
The EIA-232-D interface standard specifies all parameters for serial binary
data interchange between DTE and DCE devices using unbalanced lines.
EIA-232-D transmitter and receiver parameters applicable to the
MVME2603/2604 are listed in the following tables.
The MVME2603/2604 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 (15 m) in length, longer
cables are permissible provided the total load capacitance measured at the
interface point and including signal terminator does not exceed 2500pF.
Table B-2. 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,
including connection cable, of less than 2500pF)
2
µ
s
Open circuit slew rate
30
V/
µ
s
Table B-3. 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
