[To Operate Packet Using An External Tnc] - Alinco DR-135TMkIII Instruction Manual

[To operate packet using an external TNC]

Use the DSUB-9 connector to connect the radio and the PC. The pin allocation for the DSUB-9 on
the back of the unit is as follows:
Transceiver
Transceiver
Packet RX OUT 9600 bps
1. SQC squelch signal output. Carrier in: closed. Open collector output.
2. Packet reception DATA output (9600bps) output level 500mVrms/10Kohm
3. Packet transmission DATA input (9600bps) input level 300mV/600ohm Max input level 600mV.
4. Packet reception DATA output (1200bps) output level 100mV/600ohm
5. Ground
6. No Connection
7. PTT signal input : Low (GND) : TX, Open: RX
8. 5.0Vdc output: Max current less than 50mA
9. Packet transmission DATA input (1200bps): input level 100mV/600ohm
1200 bps
FM Packet TNC
DATA DATA
GND
IN OUT
GND
Packet RX OUT
1200 bps
Packet TX IN
1200 bps
EXT. PTT Input
9600 bps
FM Packet TNC
DATA DATA
GND
IN OUT
GND
Packet TX IN 9600 bps
EXT. PTT Input
5 4 3 2
9 8 7 6
PTT
RS-232C
PTT
RS-232C
1
Pin numbering
looking at rear of radio
8. PACKET OPERATION
Personal Computer
Personal Computer
41