Micro-Aide LDM-1 Manual de usuario descargar pdf (Pagina 18)

LDM User Manual

ACCESSING THE LDM-1 PCB

The various LDM-1 settings are controlled by jumpers and switches. They are

located on the LDM-1’s PCB. Only the Equalization (SW3) setting can be

accessed externally of the standalone modem. The other settings require that

the cover of the standalone unit be removed or that the plug-in PCB be

removed from its LDM-16 nest.

The cover of the standalone unit can be removed by removing the four screws

at the side of the unit. The plug-in PCBs can be removed by first unfastening

the hinged front cover of the LDM-16. Remove the PCB retaining bar located

at the top front edge of the nest. It is secured by two screws. The xmt/rcv and

power connectors should then be unfastened at the rear of the nest. Remove

the plug-in PCB by depressing the PCB retainer at the bottom front edge of

the nest while rotating the PCB’s card ejector upward.

USER CONFIGURED SETTINGS

Two switch assemblies and four jumpers comprise the collection of user con-

figured settings. Table 1 provides a brief definition of each setting. Also

included in Table 1 are the factory default settings.

CAUTION: Electrostatic discharges can cause serious damage to electronic

components. Normal anti-static precautions are recommended when han-

dling the LDM-1 PCB.

Label Description Position / Setting Default Setting

AX1 Receive channel termination On or Off On (150Ohms)

AX2 Transmit channel termination On or Off On (150Ohms)

AX3 Transmit channel busy detector On or Off Off (disabled

AX5 RS-232 protective ground On or Off Off (isolated)

SW2 RTS to CTS delay (msec.) 64 32 16 8 8 msec.

SW3 Receive channel Equilization see below Minimum

Table 1 - User Configured Settings

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 47 48

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Micro-Aide LDM-1 Manual de usuario Pagina 18