Matrix Orbital LK202-25 Legacy - Manual (Page 10)

LK202-25 rev 3 10
If you don't want to modify cable wiring yourself, Matrix Orbital can supply an adapter cable designed to
use with the display module when it's installed in a PC. The cable is wired as shown in Figure 2-6 below.
Figure 2-6 Twelve volt power cable
2.1.2 RS-232 Communications
A standard DB-9F is provided for RS-232 communications. Power may also be supplied via this
connector if desired. See Figure 2-7 for pin connections.
Figure 2-7 RS-232 and power connector
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. Note that 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.
Pin Number Direction Description
2 from LCD module Data Out
3 to LCD module Data In
5 - Ground
The power connector on the PC cable is wired as shown in Figure 2-7.
2.2 General Purpose Outputs
The LK202-25 has six general purpose outputs. These are provided to control relays or other electronic
devices. This allows external devices to be turned on or off using your PC or controller and software
commands. (See sections 6.1.8 and 6.1.9 for the command syntax.)