Specifications

Appendix A - EIA Specification Summary RS-422 And RS-485 Applications Ebook
Page 88 of 137 Manual Documentation Number: <DocNumber>
www.bb-elec.com/
www.bb-europe.com/
Specifications
RS-232
RS-423
RS-422
RS-485
Mode of Operation
Single-ended
Single-ended
Differential
Differential
Total Number of Drivers and Receivers on One Line
(One driver active at a time for RS485 networks)
1 driver
1 receiver
1 driver
10 receivers
1 driver
10 receivers
32 drivers
32 receivers
Maximum Cable Length
50 ft
4000 ft
4000 ft
4000 ft
Maximum Data Rate (40ft. - 4000ft. for RS422/RS485)
20 kbps
100 kbps
100 kbps to
10 Mbps
100 kbps to
10 Mbps
Maximum Driver Output Voltage
±25 V
±6 V
-0.25 V to +6 V
-7 V to +12 V
Driver Output Signal Level (Loaded Min.) - Loaded
±5 V to ±15 V
±3.6 V
±2 V
±1.5 V
Driver Output Signal Level (Unloaded Max) - Unloaded
±25 V
±6 V
±6 V
±6 V
Driver Load Impedance (Ohms)
3k ohm to 7k
ohm
450 ohm
100 ohms
54 ohms
Max. Driver Current in High Z State
n/a
n/a
n/a
±100µA
Max. Driver Current in High Z State
±6 mA @ ±2 V
±100 µA
±100 µA
±100 µA
Slew Rate (Max.)
30 V/µS
Adjustable
n/a
n/a
Receiver Input Voltage Range
±15 V
±12 V
-10 V to +10 V
-7 V to +12 V
Receiver Input Sensitivity
±3 V
±200 mV
±200 mV
±200 mV
Receiver Input Resistance (Ohms), (1 Standard Load
for RS485)
3 kohm to 7
kohm
4 kohm min
4 kohm min
greater than 12
kohm