Sailor RT2047 Manuel de service télécharger pdf (Page 59)

2 CIRCUIT DESCRIPTION RT2047 DSC - PART II

Q5-7, R18-7 and R19-7 is the Interrupt driver circuit and U10/2-7, Q4-7, C17-7, R14-7 - 16-7 and R22/

1-7 - R22/4-7 forms the serial interface circuit. This circuit transforms the µC’s two-wire serial

communication interface (SCI) into the one-wire SCI required for communication with external units. Data

output from the µC can be detected on pin PD1 and data input on pin PD0. The one-wire asynchronized

signal can be measured on R15-7 or P1/15-7.

2.7.6 DUAL WATCH

When the radio is dual-watching the receiver is watching CH16 for 100 mS once every 1.5 sec. If there

is a carrier on CH16 the receiver will stay there until the carrier disappears. When there is no carrier on

CH16 only the number of the primary channel is shown in the display along with the DW-symbol. The µC

on the keyboard is taking care of the timing and is requesting every change of channel.

2.7.7 SCANNING

When the radio is scanning the radio is listening to the channels in the scanning table for 100 mS each.

CH16 is being watched for 100 mS between every change of channel. If there is a carrier the receiver will

start dual watching on this channel as long as the SCAN TIME is set. There is built in hold time of 1.5

second so the receiver will stay there for 1.5 see after the carrier has disappeared.

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Sailor RT2047 Manuel de service Page 59