Tait TM8000 Series Applications Manual

Also see for TM8000 Series: Service manual Service manual Installation instructions Operation and service manual Service manual

Contents

Tait TM8000 Series Applications Manual Manual pdf 71 page image

TM8000 3DK Hardware Developer’s Kit Application Manual Programmable I/O Lines 71September 2003 © Tait Electronics Ltd3.2.3 Channel Locked StatusApplication This output signal is used to indicate the frequency lock status of thesynthesizer and is constantly activated during normal operation. The outputis deactivated, if the radio synthesizer is unable to “lock” to the currentchannel frequency, which can be caused by a hardware fault.The deactivation of this output always coincides with the “OL” (out oflock) control head display.Note During channel change, although the synthesizer has to re-syn-chronise with the new channel frequency, this output will not betemporarily deactivated.Configuration Configure an output line and associate it with this action. Set the active stateto be high or low (as required).Timing The maximum time out of lock before this action is activated (e.g. duringchannel change) is 50ms.Description When the radio detects a change of the synthesizer lock detect state, theradio sets the state of this output line to reflect the lock detect state. Whenthe synthesizer is locked, the output line is active. When the synthesizer isnot locked, the output line is inactive.Related Actions None.3.2.4 Reflected PTT StatusApplication This action is used to report the PTT status by generating a logic OR of allPTT sources programmed to reflect their status. The priority does not affectthe logic OR.Configuration 1. In the PTT form, configure the ‘PTT State is Reflected’ check boxfor each PTT type.2. In the Programmable I/O form, configure an output line andassociate it with this action. Set the active state to be high or low (asrequired).Timing The response time of this output line is less than 2ms.Description When the radio detects a change in PTT state, it sets the state of this outputline to reflect the PTT state. When any PTT state changes to active, theoutput line is active. When all PTT states change to inactive, the output lineis inactive.Related Actions The external PTTs can be monitored directly by the external application.