Matrix Orbital GLK12232-25-SM Legacy - Manual (Page 9)

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2.1.1 Power Connections
Power is applied to one of the two headers, depending on what style you may require. Power requirement is
+5 VDC ±0.25V. Two connections are provided for convenience depending on the type of connector
installed.
Warning:
• Do not apply any power with reversed polarization.
• Do not apply any voltage other than the specified voltage.
• Do not use any cables other than the cables supplied by Matrix Orbital,
unless you are aware of the modifications required.
• Do not apply power to the DB-9 connector AND the power connector
• Do not apply more than +5Vdc to pin #9 on the DB-9 connector.
2.1.2 RS-232 Communications
A 4 pin SIP connector can be connected to a Matrix Orbital-supplied PC cable (see section 1.5 for
description of this cable).
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 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 +/-123V to +/- 12V. It will can also
operate correctly at TTL (0 to +5V) levels. To use standard RS232 no modifications are required, for TTL,
please see below.
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