Proper Grounding; Table B-5. Eia-530 Interface Transmitter Characteristics; Table B-6. Eia-530 Interface Receiver Characteristics - Motorola MVME2700 Series Installation And Use Manual

Table B-5. EIA-530 Interface Transmitter Characteristics

Output offset voltage (with 100Ω load)
Short circuit output current (for any
voltage between −7V and +7V)
Power off output current (for any voltage
between −7V and +7V)
Output transition time (with 100Ω, 15pF
load)

Table B-6. EIA-530 Interface Receiver Characteristics

Differential input voltage
Input offset voltage
Differential input high threshold voltage
Differential input low threshold voltage
Input hysteresis
Input impedance (−15V < V

Proper Grounding

An important subject to consider is the use of ground pins. There are two
pins labeled GND. Pin 7 is the signal ground and must be connected to the
distant device to complete the circuit. Pin 1 is the chassis ground, but it
must be used with care. The chassis is connected to the power ground
through the green wire in the power cord and must be connected to be in
compliance with the electrical code.
The problem is that when units are connected to different electrical outlets,
there may be several volts of difference in ground potential. If pin 1 of each
device is interconnected with the others via cable, several amperes of
http://www.motorola.com/computer/literature
Parameter
Parameter
< +15V)
in
Proper Grounding
Value
Minimum Maximum
2.0
±180
±100
15
Value
Minimum Maximum
±12
±12
200
−200
1.0
3000 7000
B
Unit
V
mA
µA
ns
Unit
V
V
mV
V
V
W
B-9