Motorola MVME162, User Manual

Page: 97 / 106

EIA-232-D Connections
MVME162/D2 A-3
A
N
otes
1. A high EIA-232-D signal level is +3 to +15 volts. A low level is
-3 to -15 volts. Connecting units in parallel may produce out-
of-range voltages and is contrary to specifications.
2. The EIA-232-D interface is intended to connect a terminal to a
modem. When computers are connected without modems,
one computer must be configured as a modem and the other
as a terminal.
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 MVME162 are
listed in Tables A-2 and A-3.
Table A-2. EIA-232-D Interface Transmitter Characteristics
Parameter
Value
Minimum Maximum
Unit
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
Ω
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