Matrix Orbital PK202-25 - Manual (Page 13)

Figure 8: RS-232 and Power Connector
Figure 9: Power Applied via DB9
The RS-232 connector on the PC cable is wired so that a standard ‘straight through’ 9 pin D-sub cable
may be used to connect the module to a standard serial port such as COM ports on PCs. Please see the figure
below for pinout configuration.
NOTE This device complies with the EIA232 standard in that it uses signal levels from
+/- 3V to +/- 12V. It will not operate correctly at TTL (0 to +5V) levels with out modifica-
tion. A null modem cable will not work.
Table 4: RS-232 Pinout
Pin Number Direction Description LCD Host
2 Data from LCD Data out (LCD) Tx Rx
3 Data to LCD Data in (LCD) Rx Tx
5 - Ground gnd gnd
Matrix Orbital PK202-25 9