RS-232
Cabling: Single ended
Communication mode: Full duplex
Number of devices: 1 Transmitter, 1 receiver
Max. Data rate: 19.2 Kbps for 50 feet
Signalling: Unbalanced
Max. Distance: 50 feet at 19.2 kbps
Mark (data 1): -5v min to -15 max
Space (data 0): 5v min to 15v max
Output current : 500 mA
RS-422
Cabling: Single ended
Communication mode: Full duplex, Half duplex
Number of devices: 5 Transmitter, 10 receiver
Max. Data rate: 10 MBPS for 50 feet
Signalling: Balanced
Mark (data 1): 2v min (B>A) to 6v max (B>A)
Max. distance: 4000 feet at 100Kbps
Space (data 0): 2v min to 6v max (A>B)
Output current: 150mA
RS-485
Cabling: Multi-drop
Communication mode: Full duplex, Half duplex
Number of devices: 32 Transmitter, 32 receiver
Max. Data rate: 10 MBPS for 50 feet
Signalling: Balanced
Mark (data 1): 1.5v min (B>A) to 5v max (B>A)
Max. distance: 4000 feet at 100Kbps
Space (data 0): 1.5v min to 5v max (A>B)
Output current: 250mA