Matrix Orbital LCD2041 Legacy - Manual (Page 9)

2.1.4 Applying Power through the DB-9 Connector
Power may be provided to the module by pin 9 of the DB-9 connector instead of through the 4-pin SIP.
If power is to be applied using the DB-9, it must be a regulated 5Vdc supply.
NOTE This applies to wide voltage units, V and VPT extensions, as well as to standard
5 volt units.
Figure 8: DB-9 Power
To use pin 9 as the power source, the user must solder the 5 volt jumper pad beside the DB-9 connector.
WARNING Application of a voltage to pin 9 greater than 5.25 volts
may cause immediate destruction of unit and void the Manufacturer’s
Warranty.
2.2 RS-232 Communications
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 note that this
device complies with the EIA-232 standard in that it uses signal levels from ± 12V to ± 12V and can be
converted to TTL levels as well. The display is set at 19.2Kbps default speed. Other settings are;
• 8 bits, no parity, 1 stop bit.
2.2.1 DB9 Connections
A standard DB-9F is provided for RS-232 communications. Power may also be supplied via this con-
nector if desired.
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