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Commands Chapter 5
EuroPak-15a Receiver User Manual Rev 5 55
Abbreviated ASCII Syntax: Message ID: 230
ASCII Example:
EXTERNALCLOCK DISABLE
or
EXTERNALCLOCK USER 10MHZ 1.0167E-23 6.87621E-25 8.1762E-26
or
EXTERNALCLOCK TCXO 5MHZ
Table 24: Clock Type
Table 25: Pre-Defined Values for Oscillators
EXTERNALCLOCK CLOCKTYPE [ FREQ ][ h0 [ h1 [ h2 ]]]
Field
Field
Type
ASCII
Value
Binary
Value
Description
Binary
Format
Binary
Bytes
Binary
Offset
1 header
This field contains the Abbreviated ASCII command name. See
Section 4.1 on Page 31.
H 0
2 clocktype See Table 24 on
Page 55
Clock type Enum 4 H
3 freq 0MHz 0 Optional frequency. If a value is not
specified, the default is 5 MHz.
Enum 4 H+4
5MHz 1
10MHz 2
20MHz 3
4 h0 1.0 e-31 to 1.0 e-18 Optional timing standards. These
fields are only valid when the USER
clocktype is selected.
Double 8 H+8
5 h1 1.0 e-31 to 1.0 e-18 Double 8 H+16
6 h2 1.0 e-31 to 1.0 e-18 Double 8 H+24
ASCII Binary Description
DISABLE 0 Turns the external clock input off, reverts back to the on-board VCTCXO
TCXO 1 Sets the pre-defined values for a VCTCXO
OCXO 2 Sets the pre-defined values for an OCXO
RUBIDIUM 3 Sets the pre-defined values for a rubidium oscillator
CESIUM 4 Sets the pre-defined values for a cesium oscillator
USER 5 Defines custom process noise elements
Clock Type
h
0
h
-1
h
-2
VCTCXO 1.0 e-21 1.0 e-20 1.0 e-20
OCXO 2.51 e-26 2.51 e-23 2.51 e-22
Rubidium 1.0 e-23 1.0 e-22 1.3 e-26
Cesium 2.0 e-20 7.0 e-23 4.0 e-29