G-7801C FS Transmitter

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Digital Telemeters with FSK Transmitters, Receivers and Transceivers

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DataSheet: G-7801.pdf 06-19-02 34KB

G-7801C Parallel-To-Serial, FS Transmitter

The G-7801C Parallel-to-Serial, Fs Transmitter incorporates a 16-bit parallel encoder driving a three-frequency frequency-shift transmitter. The 16 inputs are typically from a contact or a transistor driver, keyed either low or high.

The timing circuitry of the G-7801C sequentially scans each of the 16 digital data lines. Before the data is scanned, sync pulse is generated at the space key input of the FS transmitter. This sync pulse is two units of time long and signifies the beginning of the data stream. At the end of the 16-bit stream, the parity generator adds a single bit to indicate parity. With two sync timing units and 17 data units, the total message length is 19 bits. This data and parity message stream keys the mark input of the FS transmitter. A local crystal-controlled oscillator provides the master timing pulses.

A drivider after the clock allows the bits-per-second to be selected by a solderless jumper. The possible rates of 30, 60, 120, 240, or 480 bits-per-second allow updated rates. The channel bandwidth typically required numerically twice that of the bits-per-second rate. A G-7801C-E is available to extend the data message to 32 status inputs.

This highly secure and noise immune method of transmission is suitable for transmitting kWh information in either BCD or pulse form. Status information can be transmitted from a remote to master location and controls can be asserted on a remote location by a master.

Specifications

Center Frequency and Bandwidth: Provided to order in the range of 300 Hz to 10 kHz. Frequencies beyond 10kHz available.
Frequency Stability: 0.15% +/-2 Hz in temperature range of -10 ° C to +55° C.
Tone Output Level: -25 to +3 dBm into 600 ohms.
Filter: Solder-in type with plug-in filter option, 600 ohm nominal with rising impedance out of band.
Squelch: Timing oscillator switched on and off by start-stop inputs of the encoder section.
Status/Control Inputs: Dry contact standard, CMOS inputs optional.
Data Rates: Jumper selectable; fixed rates of 30, 60, 120, 240, or 480 bits per second. Data rates crystal controlled to 0.05%.
LED Indicator: An indicator on the front panel is provided for each input, also SYNC and DATA indicators.
Power Requirement: 75 mA at 12 V, module maximum; 40 mA minimum.

16 Digital Status Inputs
30, 60, 120, 240 or 480 Bits-Per-Second Operation
Encoder and Transmitter In One Module
Parity Error Checking
Point Scan Extender Module Available

G-7801C

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16 Digital Status Inputs

30, 60, 120, 240 or 480 Bits-Per-Second Operation

Encoder and Transmitter In One Module

Parity Error Checking

Point Scan Extender Module Available

G-7801C