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Local Radio Connections
Monitor Connection
Connect the radio MON circuit to the MON relay contact terminals on the DB25 connector. Usually the common of each relay
contact switch is grounded and the normally open contact connects to the MON input. An alternative method to ground the
common of the relay internal to the unit is to jumper R376 (line 1) and R380 (line 2) with a piece of wire soldered closed.
R1 and R2 Relays
The IP-223 provides two (2) relay closures for controlling the frequency of the radio, or switching a remote ancillary device.
The F1 and F2 contacts can be connected through the DB25 connector. Usually the common of each relay contact switch is
grounded and the normally open contact connects to the radio frequency control terminals. Information on programming the
R1 and R2 relays is provided in the “Setup Information” chapter of this manual starting on page 37.
An alternative method to ground the common of the internal relay R1 is to jumper R375 (line 1) and R379 (line 2), and for
relay R2 jumper R374 (line 1) and R378 (line 2) with a piece of wire soldered closed.
Digital I/O
In addition to the two (2) standard relay closures, seven (7) lines of digital I/O are also included. These lines are open-collector
transistor outputs. They can be programmed on a per line basis to generate any of 128 combinations. They pull down to ground
and can be jumper selected to pull up to either +5V or the power supply voltage (minimum +12V).
Jumpers J8 (line 1) and J30 (line 2) are used to select the pull up voltage. Jumper position A pulls up to +5V and jumper
position B pulls to the power supply value.
NOTE: Some radios provide a pull-up voltage. When this occurs, place the jumper into the null position. Information on
programming the digital I/O lines is provided in the “Setup Information” chapter of this manual starting on
page 37.
CTCSS Connection
The IP-223 connection can be used for a recorder output or as a CTCSS (Continuos Tone Coded Squelch System) output:
Recorder output - The analog audio is generated at the connection.
CTCSS output - Each function tone can be assigned a CTCSS number which corresponds to a CTCSS frequency. See
“CTCSS Tone Frequency Table” on page 149.
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