4-6 Technical Description
4.1.5.4 Telephone I/O, Cross-Point Switch4.1.5.4 Telephone I/O, Cross-Point Switch
4.1.5.4 Telephone I/O, Cross-Point Switch4.1.5.4 Telephone I/O, Cross-Point Switch
4.1.5.4 Telephone I/O, Cross-Point Switch
The telephone line driver, receiver, DTMF oscillator, and an 8 x 8 cross-
point switch are continued in IC315. The cross-point switch selects and
combines the AF signals that correspond to the RAY230/230E's respective
operations: handset-VHF, handset-Telephone and handset-Intercom.
Connection to a telephone can be made by adding optional communication
equipment with a DTMF interface such as RAYCOM Cellular, Mini-M, etc.
4.1.6 Handset I/O4.1.6 Handset I/O
4.1.6 Handset I/O4.1.6 Handset I/O
4.1.6 Handset I/O
To connect with the handset circuit, an interface unit is provided that is
suitable for both audio and digital applications.
4.1.6.1 Audio I/O4.1.6.1 Audio I/O
4.1.6.1 Audio I/O4.1.6.1 Audio I/O
4.1.6.1 Audio I/O
A buffer circuit created by the operational amplifier (IC319 - IC321) transmits
a low-impedance AF signal between the base station and the handset.
4.1.6.2 Digital I/O4.1.6.2 Digital I/O
4.1.6.2 Digital I/O4.1.6.2 Digital I/O
4.1.6.2 Digital I/O
Because of its anti-noise characteristics, photo-couplers (PC304 - PC309)
are used to transfer the control data. The received signal data is further
subjected to waveform shaping (Q319 - Q321) and processed by the CPU.
4.1.7 NMEA Data Input4.1.7 NMEA Data Input
4.1.7 NMEA Data Input4.1.7 NMEA Data Input
4.1.7 NMEA Data Input
The circuit uses a photo-coupler (PC301) as an interface to receive data.
4.1.8 SeaTalk I/O4.1.8 SeaTalk I/O
4.1.8 SeaTalk I/O4.1.8 SeaTalk I/O
4.1.8 SeaTalk I/O
Both the transmitter and the receiver are furnished with a photo-coupled
interface to the +12 VDC power supply circuit.
4.1.9 Write Data Operation4.1.9 Write Data Operation
4.1.9 Write Data Operation4.1.9 Write Data Operation
4.1.9 Write Data Operation
The CPU writes data through the Write terminal (J302). During the write
operation, the data port of the CPU is switched to the “write” side by the
selector (IC301–IC304). The switch selection is made according to the
corresponding operation modes.
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