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Adcon A753 User Manual
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Contents
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CHAPTER 3Understanding Connectors21The SOLAR CELL ConnectorThe A753 remote wireless modem has a SOLAR CELL connector usedto interact with the device. The connector features the following pins:• Solar Input, which enables charging the internal batteries.0 CAUTION To charge the unit without causing damage to the batteries or thecharging circuit, the following electrical characteristics must bemaintained:• operating input voltage: 9 -10V• maximum input current: 100 -300mA• Battery, which enables powering external circuits. This pin is anoutput-only pin. The maximum current drawn by the attachedcircuit must not exceed 500 mA.• RxD and TxD, which are used for serial communication (19200baud) with the A753. The pinout of the SOLAR CELL connector isshown in Figure 9.Figure 9. The SOLAR CELL connectorNote: Unlike the usual power connectors, the A753 SOLAR CELL connectorfeatures no external battery power supply. Thus, the unit must beused with an installed internal battery or an external batteryconnected to the DC INPUT connector.0 WARNING The serial communication line is 3V CMOS compatible. Therefore, aspecial adapter cable must be used to reach the RS-232 levels.You might want to charge the A753 with something other than thestandard solar panel. In this case you must provide the electricalcharacteristics and configuration shown in Figure 10.Figure 10. Configuration for charging the A753 |
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