2
KCT-31
OUTLINE/FEATURES/TERMINAL FUNCTION/INSTALLATION
OUTLINE
1. The KCT-31 is a RS-232C interface cable for LMR Mobile
radios, TK-780,880,980,981 and TK-785,885.
The 9-pin (D-sub) connector is connected to an external
RS-232C terminal.
The other end of the cable is connected to the internal
connector of LMR mobile radio.
Note: You cannot write a firmware with the KCT-31.
FEATURES
1. This KCT-31 has a RS-232C-TTL level interface circuit.
2. This KCT-31 does not require an external power supply.
3. This KCT-31 can be used up to 9600 bps.
4. Compatible with an ER terminal of DTE that has the voltage
6V or more.
D-SUB Connector
Pin No. I/O
Port Name
Function
1
I
CD
Carrier detect
2
I
RD
Receive data
3
O
SD
Transmit data
4
O
ER
Data terminal ready
5
-
SG
Signal ground
6
I
DR
Data set ready
7
O
RS
Request to send
8
l
CS
Clear to send
9
-
CI
Ring indicator
Red
Black
Yellow
Green
A
B
C
9
5
1
6
Fig. 1
INSTALLATION
Note: When the COM 1 is used, A connector is unused.
When the COM 2 is used, C connector is unused.
1. Bind the unused connector to the cable with a retaining
band as shown.
Red
Black
Yellow
Green
A
B
C
When the COM 1 is used.
When the COM 2 is used.
A
B
C
1
M
O
C
O
N
S
E
Y
S
E
Y
2
M
O
C
S
E
Y
S
E
Y
O
N
connector
TERMINAL FUNCTION
2. Make sure the unit's power is tuned off.
