Telex IP-223 Tone/Console Operation, Digital I/O, Wire Jumper Settings, TX Side Settings

Tone/Console Operation

Digital I/O

In addition to the two 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 33.

CTCSS (Continuous Tone Coded Squelch System) Connection

The IP-223 connection can be used for a recorder output or as a CTCSS 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 131.

Tone/Console Operation

Tone and Console operation require jumpers set to specific locations. The following section discusses the jumper settings. See “Jumper Locations” on page 125.

2-/4-Wire Jumper Settings

2-Wire / 4-Wire Selection:	Line 1	Line 2
2-Wire A position	J33 and J34	J5 and J6
4-Wire B position	J33 and J34	J5 and J6

The RX termination J14 (line 1) and J24 (line 2) should be placed in jumper position A on 4-wire systems for a single unit at the end of a line. If multiple units are connected in parallel, only one (1) unit should have the RX termination jumper in the A position. The RX termination jumper should be in the null position on the rest of the units.

For 2-wire operation:

•PCB 750743 or PCB 750630 revision C and higher - Set J14 or J24 to the NULL position.

TX Side Settings

PCB 750743 or PCB 750630 revision C and higher

Two (2) jumpers on the transmit pair allow a degree of control over the output impedance. The jumper positions for each line, depending on how many consoles are placed in parallel, are shown below.

NOTE: PCB 750630 revision A does not have these jumpers.

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