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7
2 INSTALLATION
1
2
3
4
5
6
7
8
9
10
11
12
13
NC
NC
ANO
GND
PSQ
SMET
NC
GND
PKS
NC
PKD
GND
SS
Not connected
Not connected
Audio output from receiver
• Connect to TNC or MCP receive data pin for digital operation.
• Audio level is independent of AF gain control setting.
• Audio level can be changed via Menu No. 21 (PKT.OUT) {page 25}.
• Output impedance: 4.7 k
Shield for Pin 3
Squelch control
• Connect to TNC or MCP squelch control pin for digital operation.
• Prevents the TNC from transmitting while the receiver squelch is open.
• Squelch open: Low impedance • Squelch closed: High impedance
S-meter output
Not connected
Chassis ground
Transceiver PTT line control
• Connect to TNC or MCP transmit/receive switching pin for digital operation.
• Microphone audio input is muted when the transceiver is switched to transmit.
Not connected
Microphone audio input
• Connect to TNC or MCP transmit data pin for digital operation.
Shield for Pin 11
PTT control (in parallel with MIC jack) for connecting a footswitch or other external controller
Function
Pin No.
Pin Name
Ω
TNC/MCP
power
supply
TNC/MCP
TS-870S
PS-52
Personal computer/
dumb terminal
ACC 2 Connector
(Rear Panel view)
13
9101112
5678
1234
Black
Red