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tworst · 01-18-2016, 07:45 PM

I have a Futaba 7003SB RX that I will hook to a mini vbar. One connection between them will be the SBUS port 1 on the 7003 to the RXC on the Vbar. There are 3 wires, +V, ground and signal. Does the Vbar source the +V to the 7003 to power it? Or, do I need to bring power to the 7003 by some other method?

Josh Moen · 01-18-2016, 10:11 PM

The S. Bus cable will carry voltage to the RX.

HAL9KPCM · 01-18-2016, 11:56 PM

Yup, I'll second that. My system goes from the battery to a regulator, the regulator backfeeds to my CGY750 which backfeeds to my receiver through the SBUS cable.

PlaneHazza · 01-19-2016, 07:00 AM

It'll work, but IMO it's always a good idea to have redundant power. For the sake of a £2 Y lead, feed power to both FBL and Rx.

tworst · 01-19-2016, 11:03 AM

Sounds like a good idea to use the secondary power cable too, so I will do that.

Has anybody had to use the manually installed pull up resistor between the +V and ground on the SBUS cable when using the 7003SB with a YGE ESC?

PlaneHazza · 01-20-2016, 04:31 AM

Quote:

Originally Posted by tworst

Sounds like a good idea to use the secondary power cable too, so I will do that.

Has anybody had to use the manually installed pull up resistor between the +V and ground on the SBUS cable when using the 7003SB with a YGE ESC?

I'm not sure what you mean, sorry. Are you worried about the voltage going into the SBUS Rx? They're all HV ready I believe...

tworst · 01-24-2016, 09:07 AM

https://www.helifreak.com/showthread.php?p=4905043

Apparently, the 7003 does not have internal pull up resistors on the SBUS transmission lines and leaves the line in a tristate condition when it is not transmitting. When connecting a non Futaba device to SBUS, YGE 90 LV in my case, there is a chance of poor communications because of this.

The above is just a quick synopsis of my understanding of the issue at this point and I would recommend you read the link posted for more details. I am not sure I stated the issue with 100% accuracy but it will give you a feel for what is involved.

dchekas · 01-28-2016, 06:31 PM

This was addressed on the 7003SB several years ago. There is no need to add any special connections if your R7003SB has the gold dot between the antennas.

01-18-2016, 07:45 PM	#1 (permalink)
tworst Registered Users Join Date: Feb 2011	Will mini Vbar power Futaba 7003SB over serial link? I have a Futaba 7003SB RX that I will hook to a mini vbar. One connection between them will be the SBUS port 1 on the 7003 to the RXC on the Vbar. There are 3 wires, +V, ground and signal. Does the Vbar source the +V to the 7003 to power it? Or, do I need to bring power to the 7003 by some other method?

01-18-2016, 10:11 PM	#2 (permalink)
Josh Moen Registered Users Join Date: Oct 2009	The S. Bus cable will carry voltage to the RX. __________________ Thanks, Josh M. Team Heli Direct

01-19-2016, 07:00 AM	#4 (permalink)
PlaneHazza Registered Users Join Date: Jul 2006	It'll work, but IMO it's always a good idea to have redundant power. For the sake of a £2 Y lead, feed power to both FBL and Rx. __________________ Harry Thunder Tiger Raptor E720 CGY750 \| Mikado Logo 700 CGY760R \|SAB Kraken 580 CGY760R\| Powered by Futaba 18SZ

01-28-2016, 06:31 PM	#8 (permalink)
dchekas Registered Users My HF Map location Join Date: Sep 2006	This was addressed on the 7003SB several years ago. There is no need to add any special connections if your R7003SB has the gold dot between the antennas. __________________ Team Align Enterprise Hobby Facebook Align Part Finder YouTube Channel

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01-18-2016, 11:56 PM	#3 (permalink)
HAL9KPCM Registered Users Join Date: Jun 2013	Yup, I'll second that. My system goes from the battery to a regulator, the regulator backfeeds to my CGY750 which backfeeds to my receiver through the SBUS cable.

01-19-2016, 11:03 AM	#5 (permalink)
tworst Registered Users Thread Starter Join Date: Feb 2011	Sounds like a good idea to use the secondary power cable too, so I will do that. Has anybody had to use the manually installed pull up resistor between the +V and ground on the SBUS cable when using the 7003SB with a YGE ESC?

01-24-2016, 09:07 AM	#7 (permalink)
tworst Registered Users Thread Starter Join Date: Feb 2011	https://www.helifreak.com/showthread.php?p=4905043 Apparently, the 7003 does not have internal pull up resistors on the SBUS transmission lines and leaves the line in a tristate condition when it is not transmitting. When connecting a non Futaba device to SBUS, YGE 90 LV in my case, there is a chance of poor communications because of this. The above is just a quick synopsis of my understanding of the issue at this point and I would recommend you read the link posted for more details. I am not sure I stated the issue with 100% accuracy but it will give you a feel for what is involved.

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