Tait T2000-A75, Руководство по эксплуатации

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14 M2256-000-00-051 November 2001
RTS (Request to Send) Signal
RTS is an active high input signal to theA75 from the PC and is used to reduce data transfer
delays and improve data throughput.
RTS Inhibit is either inhibited or not, using bit 6 of the [ITEM1] parameter in the PROGRAM
command which configures the A75.
If ‘Inhibit RTS Signal’ is set to ‘1’ (RTS inhibited), then an RTS signal is ignored by the A75
(
RTS off ). When RTS is disabled, the A75 starts to transmit when data is received until the input
buffer becomes empty. Once empty, the A75 will stop transmitting after the Tail Time set in the
A75 firmware. Each time the transmitter keys up, it must wait for the Lead In Delay before data
transfer can commence.
If ‘Inhibit RTS Signal’ is set to ‘0’ (RTS not inhibited), when an RTS signal is detected ( RTS
on ) the following sequences can occur depending on the structure of the data.
If RTS turns off, the A75 will continue to transmit until the buffer is empty, and stops after the
Tail Time.
If the buffer becomes empty while RTS is still on, the A75 continues to transmit until either RTS
turns off,
or after the Tail Time if this occurs after RTS has turned off.
Time
data
buffer
empty
Tail
Time
RTS Inhibit=1
A75 PTT Tx
Lead In
Delay
Time
RTS on
data
RTS off
A75 PTT Tx
buffer
empty
Tail
Time
RTS Inhibit=0
Time
RTS on
data
RTS off
A75 PTT Tx
buffer
empty
Tail
Time (1)
RTS Inhibit=0
Time
RTS on
data
RTS off
A75 PTT Tx
buffer
empty
RTS Inhibit=0
Tail Time (2)