ABB AC 800F

7 Functional Description of the Fieldbus Modules
7-25
Static characteristics of the RS232 signals
Log. high - 3 ... - 15 V
Log. low + 3 ... + 15 V
Max. output current 22 mA (short-circuit)
Max. perm. cable length 15 m
Static characteristics of RS422 signals
Log. high > + 0.2 V, differential
Log. low < - 0.2 V, differential
Max. output voltage ± 5V
Max. output current 250 mA (short-circuit)
Min. node impedance 4 kohms
Max. number of nodes One transmitter, max. 31 receivers
Max. perm. cable length 1200 m
Static characteristics of RS485 signals
Log. high > + 0.2 V, differential
Log. low < - 0.2 V, differential
Max. output voltage ± 5V
Max. output current 250 mA (short-circuit)
Min. node impedance 4 kohms
Max. number of nodes 32 transmitters/receivers
Max. perm. cable length 1200 m
Dynamic characteristics
Transmission rate 2400 bauds, 4800 bauds, 9600 bauds,
19.2 kbauds, 38.4 kbauds (configurable)