Kenwood TK-880 Service Manual page 21

1-3. Data Equipment Connection
The jumpers must be set to either one for each function.
Otherwise, the radio will not work properly.
AHK/BUSY
R64 (0Ω) R18 (0Ω)
Yes No BUSY System busy output indicates if no
repeater channel is available in the
currently selected LTR system
when PTT is pressed, active low
: Default
No Yes AHK MIC hook input.
ME/AM
R12 (0Ω) R167 (0Ω)
Yes No AM Speaker mute input, active high
: Default
No Yes ME MIC ground.
MI/TXS
R94 (0Ω) R24 (0Ω)
Yes No TXS Transmitter sense output, active
high : Default
No Yes MI Internal MIC input.
LOK/AM
R5 (0Ω) R6 (0Ω)
Yes No AM Audio mute signal input.
No Yes LOK Link complete pulse output : Default
DTC/LOK/TXS/FSW
R168 R84 R51 R13
(0Ω) (0Ω) (0Ω) (0Ω)
No No No Yes LOK
Yes No No No DTC
No No Yes No TXS
No Yes No No FSW Foot switch input, active low
R13
R51
TX-RX unit (A/2)
Foil side view
INSTALLATION
Function
Function
Function
Function
Function
Link complete pulse output.
Data control channel signal input,
Data channel : low (Default)
Transmitter sense output,
active high
R18
R64
R84
TX-RX unit (A/2)
Component side view
Note : The following parts are not installed at the time of
shipping; R5,R13,R18,R24,R51,R84,R167
2. Accessory Terminal
2-1. Terminal Function
Connector Pin Pin I/O
No. No. name
CN1 1 DEO O Detect signal output. (Output level :
(DO) 250mVrms; standard modulation)
2 AHK I External hook signal input.
(AH) "COM2" port must be select "AUX
HOOK/PTT" / "DATA PTT" function
in the KPG-49D.
On hook : L, Off hook : H
BUSY O System busy signal output for
trunking system. No vacant repeater
: L, Vacant repeater : H
RXD2 I Serial data input 2.
"COM2" port must be select
"REM" / "DATA" / "DATA+GPS"
function in the KPG-49D.
3 IGN (IG) I Ignition input for KCT-18.
4 DI I External modulation signal input.
5 ME – MIC earth.
AM I Audio mute signal input.
6 MI I Internal MIC input.
TXS O Signal indicating whether the
transceiver is transmitting or not.
TX : H, Another : L
7 PTT I External PTT signal input.
(PT) "COM2" port must be select
"AUX HOOK/PTT" / "DATA PTT"
function in the KPG-49D.
TX : L, Another : H
TXD2 O Serial data output 2.
"COM2" port must be select
"REM" / "DATA" / "DATA+GPS"
function in the KPG-49D.
TK-880/H
R6
R5
Function
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