Patton electronics 2002 Series User Manual page 8

Inverted Data and Control Signals
Position JP1 and JP2 horizontally on the jumper posts to select
inverted data and control signals. Figure 5 shows the position of the
jumpers on the pc board. Table 4 shows the relative signal levels.
TTL Side
Figure 5: Inverted Data and Control Signal Jumpers
Table 4. Inverted Data and Control Signals
Signal Level
0.0 to 0.4 Volts
2.4 - 5.0 Volts
Inverted Data and Non-Inverted Control Signals
Position JP1 horizontally top jumper posts and remove JP2 to
select inverted data and non-inverted control signals. Figure 6 shows
the position of the jumpers on the pc board. Table 5 shows the relative
signal levels.
TTL Side
Figure 6: Inverted Data and Non-Inverted Control Signal Jumpers
Table 5. Inverted Data, Non-Inverted Control Signals
Signal Level
0.0 to 0.4 Volts
2.4 - 5.0 Volts
Data Signals Control Signals
mark
space
Data Signals Control Signals
mark
space
7
JP1
JP2
RS-232 Side
inactive
active
JP1
JP2
RS-232 Side
active
inactive