# Zyfer GPStarplus Receiver

## 1. Synopsis

    Name: zyfer
    Reference ID: GPS
    Serial Port: /dev/zyferu; 9600 bps 8N1

## 2. Description

This driver supports the Zyfer GPStarplus receiver.

The receiver has a DB15 port on the back which has input TxD and RxD lines for configuration and control, and a separate TxD line for the once-per-second timestamp.

Additionally, there are BNC connectors on the back for things like PPS and IRIG output.

## 3. Additional Information

Reference Clock Drivers

## 4. Driver Options

`unit` number

  The driver unit number, defaulting to 0. Used as a distinguishing suffix in the driver device name.

`time1` time

  Not used by this driver.

`time2` time

  Not used by this driver.

`stratum` number

  Specifies the driver stratum, in decimal from 0 to 15, with default 0.

`refid` string

  Specifies the driver reference identifier, an ASCII string from one to four characters, with default `GPS`.

`flag1 {0 | 1}`

  Not used by this driver.

`flag2 {0 | 1}`

  Not used by this driver.

`flag3 {0 | 1}`

  Not used by this driver.

`flag4 {0 | 1}`

  Not used by this driver.

`subtype`

  Not used by this driver.

`mode`

  Not used by this driver.

`path` filename

  Overrides the default device path.

`ppspath` filename

  Not used by this driver.

`baud` number

  Overrides the default baud rate.

## 5. Configuration Example

    refclock zyfer

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