Seriously!
Yes
RS-232 logic and voltage levels
Data circuits Control circuits Voltage
0 (space) Asserted +3 to +15 V
1 (mark) Deasserted −15 to −3 V
For TTL, asserted is 0V
Seriously!
Yes
RS-232 logic and voltage levels
Data circuits Control circuits Voltage
0 (space) Asserted +3 to +15 V
1 (mark) Deasserted −15 to −3 V
For TTL, asserted is 0V