Owner manual

2.1.1 Power Connections

WARNINGS

• 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 aware of the modiﬁcations required.

• Do not under any circumstances use an unmodiﬁed ﬂoppy drive

power cable.

• Do not apply power to both the DB-9 connector AND the 4-pin

power connector.

• Do not apply more than +5Vdc to pin #9 of the DB-9 connector.

2.1.2 RS-232 Communications

A group of four connections (pins 7-10) provide for RS-232 communications and power. A 4 pin SIP

connector soldered to these pins can be connected to a Matrix Orbital supplied PC 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 +/- 3V to +/- 12V. It will not

operate correctly at TTL (0 to +5V) levels.

Table 2: 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

2.1.3 I

C Communications

The display has I

C communications runs at 100 Kbps and supports up to 127 units on a single com-

munications line. The I

C data line operates on 5 volt CMOS levels. The power connector is also the I

communication line.

Figure 3: Power and I

C Connector

Matrix Orbital GLK12232-25-WBL 6