Voyager LECP

VOYAGER

Voyager LECP Data Analysis Handbook

Calibrations and Channel Definitions

Table 8. MJS77 FDS to Science Commands

(MJS77-3-290, Rev. B)

*SC25AH (1)(2)(3)(4)

*		M S B											L S B
ID	FDS Word Bit Number	16	15	14	13	12	11	10	9	8	7	6	5
ID	FDS to Instrument CMD Bit Number	12	11	10	9	8	7	6	5	4	3	2	1
	Address Select	0	0
(1)	LEPT D4 Off			0
(1)	LEPT D4 On			1
(2)	LEPT D3 Off				0
	LEPT D3 On				1
	LEPT D2 Off					0
	LEPT D2 On					1
	LEPT D1C Off						0
	LEPT D1C On						1
(3)	LEPT D1B Off							0
	LEPT D1B On							1
	LEPT D1A Off								0
	LEPT D1A On								1
	LEPT AC VII and VIII Off									0
	LEPT AC VII and VIII On									1
(4)	LEPT AC V and VI Off										0
	LEPT AC V and VI On										1
	LEPT AC III and IV Off											0
	LEPT AC III and IV On											1
	LEPT AC I and II Off												0
	LEPT AC I and II On												1

SC25AH LECP Command Word, Table 8-1. (Ed.: Variation #1 of 4 of Table 8, MJS77 FDS to Science Commands.)

NOTES:

If the first field (FDS word bit number 16 to 14) is 0 or 1, select Table 8-1 (variation #1 of Table 8).
If the first field (FDS word bit number 16 to 14) is 2 or 3, select Table 8-2 (variation #2 of Table 8).
If the first field (FDS word bit number 16 to 14) is 4 or 5, select Table 8-3 (variation #3 of Table 8).
If the first field (FDS word bit number 16 to 14) is 6 or 7, select Table 8-4 (variation #4 of Table 8).
The above note applies to all SC25AH commands.

Table 8-2 (Variation #2 of Table 8)

*SC25AH (1)(2)(3)(4)

*		M S B											L S B
ID	FDS Word Bit Number	16	15	14	13	12	11	10	9	8	7	6	5
ID	FDS to Instrument CMD Bit Number	12	11	10	9	8	7	6	5	4	3	2	1
(1)	Address Select	0	1
	Low Bias Off			0
	Low Bias On			1
(2)	High Bias Off				0
	High Bias On				1
	D1 Σ Off					0
	D1 Σ On					1
	LEMPA B Off						0
	LEMPA B On						1
(3)	LEMPA A Off							0
	LEMPA A On							1
	LEMPA δ and δ' Off								0
	LEMPA δ and δ' On								1
	LEMPA γ Off									0
	LEMPA γ On									1
(4)	LEMPA β and β' Off										0
	LEMPA β and β' On										1
	LEMPA α Off											0
	LEMPA α On											1
	LEPT D5 Off												0
	LEPT D5 On												1

Table 8-3 (Variation #3 of Table 8)

*SC25AH (1)(2)(3)(4)

*		M S B											L S B
ID	FDS Word Bit Number	16	15	14	13	12	11	10	9	8	7	6	5
ID	FDS to Instrument CMD Bit Number	12	11	10	9	8	7	6	5	4	3	2	1
(1)	Address Select	1	0
	MTR Pulse Frequency - 50 Hz			0
	MTR Pulse Frequency - 60 Hz			1
(2)	D1 Fast Chan - Not Subcommutated				0
	D1 Fast Chan - Subcommutated				1
	Motor Scan - Reduced					0
	Motor Scan - Full					1
	Emergency Motor Pwr - Off (Normal Step)						0
	Emergency Motor Pwr - On						1
(3)	Motor Drive Pwr - Normal							0
	Motor Drive Pwr - Increased							1
	Motor Step Rate - Normal								0
	Motor Step Rate - Accelerated								1
	Normal Scan									0
	Motor to Commanded Position									1
6	Motor Position - Sector 1										1	1	0
5	Motor Position - Sector 2										1	0	1
4	Motor Position - Sector 3										1	0	0
0	Motor Position - Sector 4										0	0	0
1	Motor Position - Sector 5										0	0	1
2	Motor Position - Sector 6										0	1	0
3	Motor Position - Sector 7										0	1	1
7	Motor Position - Sector 8										1	1	1

Table 8-4 (Variation #4 of Table 8)

*SC25AH (1)(2)(3)(4)

*		M S B											L S B
ID	FDS Word Bit Number	16	15	14	13	12	11	10	9	8	7	6	5
ID	FDS to Instrument CMD Bit Number	12	11	10	9	8	7	6	5	4	3	2	1
(1)	Address Select	1	1
	Spare			0
	Spare			1
(2)	Normal Rate Channel Select				0
	Rate Failure Format Mode				1
	PHA - Normal Coincidence Req-d					0
	PHA - Reduced Coincidence Req'd					1
	Rate Chan 44 & 45 - not Subcommutated						0
	Rate Chan 44 & 45 - Subcommutated						1
(3)	α, β, β' - Normal Threshold							0
	α, β, β' - Decrease Discriminator Level							1
	LEPT HIgh - Off								0
	LEPT HIGH - On								1
	PHA Pwr - Off									0
	PHA Pwr - On									1
(4)	Calibrator - Off										0
	Calibrator - On										1
	LEPT/LEMPA Control - LEMPA											0
	LEPT/LEMPA Control - LEPT											1
	LEPT/LEMPA Alternate - Off												0
	LEPT/LEMPA Alternate - On												1

Return to Calibrations main page.

Return to Voyager LECP Data Analysis Handbook Table of Contents.
Return to Fundamental Technologies Home Page.

Updated 8/9/19, Cameron Crane

VOYAGER 1 ELAPSED TIME

--:--:--:--

Days: Hours: Minutes: Seconds

*Since official launch
September 5, 1977, 12:56:00:00 UTC

VOYAGER 2 ELAPSED TIME

--:--:--:--

Days: Hours: Minutes: Seconds

*Since official launch
August 20, 1977, 14:29:00:00 UTC

QUICK FACTS

Manufacturer: Voyagers 1 and 2 were built in the Jet Propulsion Laboratory in Southern California.

Mission Duration: 40+ years have elapsed for both Voyager 1 and Voyager 2 (both are ongoing).

Destination: Their original destinations were Saturn and Jupiter. Their current destination is interstellar space.

Calibrations and Channel Definitions

Table 8. MJS77 FDS to Science Commands

(MJS77-3-290, Rev. B)

VOYAGER 1 ELAPSED TIME

VOYAGER 2 ELAPSED TIME

QUICK FACTS

RELATED LINKS