Specifications

111
Co-located Radio Station
NOTES:
• Set the polarity for DIG DATA and DIG MODE in the file oparam.cds (full details
on software settings can be found in System Configuration Files on page 217).
Typical settings are shown in the following table
.
• Various timing parameters such as PTT keying and analog/digital settling delay are
settable in the oparam.cds configuration file.
Modifications for TTL Data Signal Levels
In some applications, RS-232 data signal levels are not desired for radio station
connections. If either the DIG DATA or DIG MODE signals from the paging terminal
need to be converted to TTL data signal levels, the circuit shown in Figure 19 may be
inserted between the paging terminal and the radio transmitter input.
Figure 19: RS-232 to TTL Data Level Conversion
pp Meaning cc qq ...
05 Mode signal polarity 02 01 = high value for digital page
06 Digital data polarity 02 00 = inverted data
+5V
TTL level
output to
transmitter
3.3kΩ
¼W
10kΩ
¼W
Data output
from Series
2000