Matrix Orbital GLK24064-25 Legacy - Manual (Page 13)

Figure 10: RS-232 and Power Connector
The RS-232 connector on the serial cable is wired so that a standard ’straight through’ 9 pin D-sub cable
may be used to connect the modules to a standard serial port such as COM ports on PCs. Note that this
device complies with the EIA232 standard in that it uses signal levels from +/-12V to +/- 12V. It will can
also operate correctly at TTL (0 to +5V) levels. To use standard RS-232 no modifications are required. For
TTL, please see below.
Table 3: 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
2.2.2 TTL Communication
Figure 11: Standard and TTL Configuration
Standard: (+/-12V to +/- 12V) Jumper 1 and 3 soldered
TTL: (0 to +5V) Jumper 2 and 4 soldered
Matrix Orbital GLK24064-25 9