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Cables for Guiding

It is a common belief that astronomical equipment shares a common standard, refered to as the ST-4 standard, but several guide cameras and mounts have either variations of this or entirely different plug and socket types to the usual 6pin 6 connection RJ-12 type modular jack type.

Cameras with a standard ST-4 Output Port.

Cameras with an STV/ STI Output Port.


Cameras with a standard ST-4 Output Port.

Pin Assignment:

1.  Not Connected
2.  Ground/ Common
3.  RA+
4.  Dec+
5.  Dec-
6.  RA-

This is the most commonly used pinout for sockets connected to Guide Cameras and cameras that have this pinout include QHY guide cameras, LVI Smart Guider, Orion StarShoot, SkyWatcher SynGuider and Guide Port Interfaces such as the astronomiser ASTGPI1, The Shoestring Astronomy GPINT and GPUSB.

The RJ12 plugs on these cables are made using high quality FCC68 rounded modular connectors. The rounded contacts on the connectors give a better connection and are ideal for multiple plug - unplug usage, keeping contact wear to a minimum. As with a lot of components I use, they are slightly more expensive than alternatives but experience has taught me what will last outside in the damp, plugging and unplugging many times over the course of the year.

As with all my cables, good quality multistrand data cable is used to give the cable the best wear and conductivity through everyday use and abuse.

ST4 Guide port connecting cables.

SkySensor 2000 Guide port connecting cables.

Takahashi Guide port connecting cables.

AstroTrac Guide port connecting cables.


ST4 Guide port connecting cables.

ST4 to ST4 connection (standard guideport, Losmandy, SkyWatcher, Meade and Celestron Guide Port compatible). Black PVC insulated flat six core (multistrand) high quality cable terminated in two RJ-12 plugs (6 pin 6 connection).


RJ12 (1m) Configured as ST-4 to ST-4 ASTRJ1 £5.95
RJ12 (3m) Configured as ST-4 to ST-4 ASTRJ3 £6.95
RJ12 (5m) Configured as ST-4 to ST-4 ASTRJ5 £7.95
RJ12 (10m) Configured as ST-4 to ST-4 ASTRJ10 £12.95

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ST-4 to SkySensor 2000 Guide port connecting cables.

ST4 to Vixen SkySensor 2000 connection. Black PVC insulated flat six core (multistrand) high quality cable terminated in two RJ-12 plugs (6 pin 6 connection) - the plug at the SS2K end is rewired and shrinkwrapped to suit the SS2K pinout.


RJ12 (1m) Configured as ST-4 to SS2K ASTSS1 £10.95
RJ12 (3m) Configured as ST-4 to SS2K ASTSS3 £11.95
RJ12 (5m) Configured as ST-4 to SS2K ASTSS5 £13.95
RJ12 (10m) Configured as ST-4 to SS2k ASTSS10 £20.95

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ST4 to Takahashi Guide port connecting cables.

ST4 to Takahashi guide port connection. Black PVC insulated flat six core (multistrand) high quality cable terminated in one RJ-12 plug (6 pin 6 connection) and a 6 pin mini DIN.


RJ12 (1m) Configured as ST-4 to Takahashi 6 Pin mini DIN ASTTK1 £10.95
RJ12 (3m) Configured as ST-4 to Takahashi 6 Pin mini DIN ASTTK3 £11.95
RJ12 (5m) Configured as ST-4 to Takahashi 6 Pin mini DIN ASTTK5 £13.95
RJ12 (10m) Configured as ST-4 to Takahashi 6 Pin mini DIN ASTTK10 £20.95

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ST4 to AstroTrac Guide port connecting cables.

ST4 to AstroTrac TT320X-AG guide port connection. Black PVC insulated flat four core (multistrand) high quality cable terminated in one RJ-12 plug (6 pin) and an 8 pin RJ-45 plug for guiding your AstroTrac in RA.


RJ12 (1m) Configured as ST-4 to AstroTrac 8 pin RJ-45 ASTAT1 £5.95
RJ12 (3m) Configured as ST-4 to AstroTrac 8 pin RJ-45 ASTAT3 £6.95
RJ12 (5m) Configured as ST-4 to AstroTrac 8 pin RJ-45 ASTAT5 £7.95
RJ12 (10m) Configured as ST-4 to AstroTrac 8 pin RJ-45 ASTAT10 £12.95

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Cameras with an STV/ STI Output Port.

Pin Assignment:

1.  RA+
2.  Dec+
3.  Dec-
4.  RA-
5.  Ground/ Common
6.  Not Connected

This pinout is used by SBIG STV and STI Guide cameras. To connect these to a standard ST4 port, a crossover cable is used and you should invert the RA and Dec guiding directions in your guide software.

The RJ12 plugs on these cables are made using high quality FCC68 rounded modular connectors. The rounded contacts on the connectors give a better connection and are ideal for multiple plug - unplug usage, keeping contact wear to a minimum. As with a lot of components I use, they are slightly more expensive than alternatives but experience has taught me what will last outside in the damp, plugging and unplugging many times over the course of the year.

As with all my cables, good quality multistrand data cable is used to give the cable the best wear and conductivity through everyday use and abuse.

STV to ST4 Guide port connecting cables.

STV to SkySensor 2000 Guide port connecting cables.

STV to Takahashi Guide port connecting cables.

STV to AstroTrac Guide port connecting cables.


STV to ST4 Guide port connecting cables.

STV to ST4 connection (standard guideport, Losmandy, SkyWatcher, Meade and Celestron Guide Port compatible). Black PVC insulated flat six core (multistrand) high quality cable terminated in two RJ-12 plugs (6 pin 6 connection).


RJ12 (1m) Configured as STV to ST-4 ASTSTVRJ1 £6.95
RJ12 (3m) Configured as STV to ST-4 ASTSTVRJ3 £7.95
RJ12 (5m) Configured as STV to ST-4 ASTSTVRJ5 £8.95
RJ12 (10m) Configured as STV to ST-4 ASTSTVRJ10 £13.95

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STV to SkySensor 2000 Guide port connecting cables.

STV to Vixen SkySensor 2000 connection. Black PVC insulated flat six core (multistrand) high quality cable terminated in two RJ-12 plugs (6 pin 6 connection) - the plug at the SS2K end is rewired and shrinkwrapped to suit the SS2K pinout.


RJ12 (1m) Configured as STV to SS2K ASTSTVSS1 £10.95
RJ12 (3m) Configured as ST-4 to SS2K ASTSS3 £11.95
RJ12 (5m) Configured as ST-4 to SS2K ASTSS5 £13.95
RJ12 (10m) Configured as ST-4 to SS2k ASTSS10 £20.95

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Takahashi Guide port connecting cables.

STV to Takahashi guide port connection. Black PVC insulated flat six core (multistrand) high quality cable terminated in one RJ-12 plug (6 pin 6 connection) and a 6 pin mini DIN.


RJ12 (1m) Configured as STV to Takahashi 6 Pin mini DIN ASTSTVTK1 £10.95
RJ12 (3m) Configured as STV to Takahashi 6 Pin mini DIN ASTTK3 £11.95
RJ12 (5m) Configured as STV to Takahashi 6 Pin mini DIN ASTSTVTK5 £13.95
RJ12 (10m) Configured as STV to Takahashi 6 Pin mini DIN ASTSTVTK10 £20.95

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AstroTrac Guide port connecting cables.

STV to AstroTrac TT320X-AG guide port connection. Black PVC insulated flat four core (multistrand) high quality cable terminated in one RJ-12 plug (6 pin) and an 8 pin RJ-45 plug for guiding your AstroTrac in RA.


RJ12 (1m) Configured as STV to AstroTrac 8 pin RJ-45 ASTSTVAT1 £5.95
RJ12 (3m) Configured as STV to AstroTrac 8 pin RJ-45 ASTSTVAT3 £6.95
RJ12 (5m) Configured as STV to AstroTrac 8 pin RJ-45 ASTSTVAT5 £7.95
RJ12 (10m) Configured as STV to AstroTrac 8 pin RJ-45 ASTSTVAT10 £12.95

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