5.2.2 Voltage specifications
Connection
Minimum
voltage
1
Nominal
voltage
1
Maximum
voltage
1
Power supply, +12 V connection
2
7 V
12 V
30 V
RS-232 input threshold low
0.8 V
–
–
RS-232 input threshold high
–
–
2.4 V
RS-232 input absolute maximum
2
–
±15 V
±18 V
RS-232 input resistance
3 kΩ
5 kΩ
7 kΩ
RS-232 output voltage swing
3
±5 V
±5.4 V
–
RS-485 input (differential)
200 mV
4
–
6 V
RS-485 output (differential)
1.5 V (at 50 Ohms)
–
–
SDM lines (high level)
4.5 V
5 V
5.5 V
SDM lines (low level)
0 V
–
0.7 V
1
Voltage values are DC.
2
It is NOT recommended that the user run their SDM-SIO1A at maximum ratings for extended periods of time.
3
Assuming a worst case 3 kΩ load.
4
It is not recommended that the user allows such low input voltages as there will be an increased chance that
external noise may cause errors in the incoming data.
5.2.3
Compliance
View
the
SDM-SIO1A
EU
Declaration
of
Conformity
at:
.
View
the
SDM-SIO4A
EU
Declaration
of
Conformity
at:
SDM-SIO1A and SDM-SIO4A Serial Input/Output Modules
6
