TK-280
12
OPERATING FEATURES
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Short Messase (Optional)
A maximum of 48 characters can be sent (External
equipment is required). Received Short Messages will be
displayed in the same manner as a Status Message. A
maximum of 15 received messages can be stored in the stack
memory. In the Stack Mode, 3-digit LCD indicates the received
Short Message as “Q1”~”Q15".
■
Long Message
A maximum of 4096 characters can be sent (External
equipment is required). Received Long Message will not be
displayed or stacked in the radio memory but is output through
the COM (Data) port.
■
Emergency Function
Emergency status 99 will be sent at the beginning of each
emergency transmission.
●
Emergency Status response
“Alert” can be selected for the called radio unit’s response
to reception of status 99 which is used as an emergency
status.
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Other Functions
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Manual Dial
Fleet, ID and Status numbers can be entered from DTMF
keypad. (DTMF microphopne is required.)
●
Data TX with QT/DQT
Whether programmed QT/DQT is modulated or not with a
data transmission except for Selcall. A radio unit can receive
a data message regardless of QT/DQT if the receiving unit
is not scanning.
●
DMS Baud Rate
FFSK data baud rate setting. The same rate must be set
as a communication partner.
1200bps :
D a t a c o m m u n i c a t i o n i s m a d e i n 1 2 0 0 b p s . T h e
communication area is much wider than 2400bps.
Recommended for repeater operation.
2400bps :
D a t a c o m m u n i c a t i o n i s m a d e i n 2 4 0 0 b p s . T h e
communication area is narrower than 1200bps, but it will
decrease the data traffic. Data rate 2400bps may not work
properly depending on the repeater’s characteristic.
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Inter-fleet call
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Status/Short/Long Message on Data Group/Channel
Status/Short/Long Message transmission is made whether
on the Data Group/Channel.
●
Status/Short/Unit ID Message Serial Output
Whether a received Status/Short message or PTT ID is
outputed or not to serial port.
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Parameters
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GTC Count
Number of “Go To data Channel” messages to be sent
before transmitting a data message if it is being made on
Data Group/Channel. If a radio unit receives a GTC
message, it will move to the Data Group/Channel of the
current Group. Increase this item to make sure the called
radio unit moves to the Data Group/Channel.
●
Random Access (Contention)
When a channel is busy, radio unit will not transmit
(depending on its Busy Channel Lockout setting). As soon
as a channel is cleared, some transmissions may crash.
Random access is used to avoid this by employing a random
transmission sequence.
●
Number of Retries
Number of Retries is the maximum number of retry
transmission when no acknowledgement is received in the
Maximum ACK Wait Time. Increase this item to improve
data communication reliability.
●
TX Busy Wait Time
TX Busy Wait Time is the maximum amount of time before
giving up the data transmission when the channel is busy.
Also, this timer affects if it expires during Random Access
period.
●
Maximum ACK Wait Time
Maximum ACK Wait Time is the maximum amount of time
to wait for an acknowledgement from the called radio unit.
It is used as an interval time of retries. It must be set greater
than the ACK Delay Time of the called radio unit.
●
ACK Delay Time
ACK Delay Time is the amount of time from the end of
receiving a data to the beginning of sending an
acknowledgement. It should be adjusted as the repeater’s
hang-up delay time. Also, it must be set less than the
Maximum ACK Wait Time of the calling radio unit.
●
TX Delay Time (RX Capture)
TX Delay Time is the amount of unmodulated transmission to
let the called unit stop scanning or exit its battery save mode.
It is used only when starting a data communication sequence.
●
Data TX Modulation Delay Time
Data TX Modulation Delay Time is the amount of time from
the beginning of transmission to the beginning of a data
modulation. It is used every time data is transmitted.
