Phat scooter caddy

[Tommytexzr1]

Hello, I have a phat scooter caddy and can’t figure out how to connect to it. From all the research I have done I believe it has a em50sp per SIAECOSYS. I have purchased two usb cables see attached photos. Unfortunately there is no plug coming from the controller that matches it. I am guessing this is a custom wiring harness for this cart. Does anyone have any suggestions on how to connect to this? SIAECOSYS told me it needs to be CAN to usb but I thought that is what I bought.

 

[amberwolf]

Hello, I have a phat scooter caddy and can’t figure out how to connect to it. From all the research I have done I believe it has a em50sp per SIAECOSYS. I have purchased two usb cables see attached photos. Unfortunately there is no plug coming from the controller that matches it. I am guessing this is a custom wiring harness for this cart. Does anyone have any suggestions on how to connect to this? SIAECOSYS told me it needs to be CAN to usb but I thought that is what I bought.

What is a "phat scooter caddy" (or "caddie", as you have it spelled both ways)? And what are you trying to connect it to, for what purpose?

Regarding what controller might be in something, you can see if it has a label on it. If it does, posting a clear well-lit picture of that label might help us help you identify it.

However, even if you find it is a model that is normally programmable, the manufacturer of the vehicle it is in may have had it built with custom firmware (OEM) that does not allow any user changes or access. They might not even have had the connector or interface parts installed in it to do so, to help prevent changes to the vehicle for legal or other reasons.

 

[Tommytexzr1]

I have corrected the spelling of the name. I have seen it both ways on line. Two types of this scooter were made golf and sport. I am trying to change my golf setting to sport. SIAECOSYS has sent me the program (EM_V3-49V EN) and the ini file. I know the two pins TXD (pin 14) and RXD (pin 15) for the CAN connection but it still won’t connect. I attached two pictures of the controller labels and one picture of the error I keep getting. I am close just need help to get over the finish line.

 

[npwein]

I have the same machine — a PHAT Golf HD, and my controller is a near-twin of yours. Case stamp A91072C8030HC / CAN TP / 22/06/01 vs your 29HC / 22/04/05. Sequential lot numbers, seven weeks apart, same PHAT order. Posting what I've worked out in case it helps, and because there's nothing else on the internet about these.

@Tommytexzr1 — I think I can see your problem in your error screenshot.

You have CAN enable ticked but baudrate set to 9600. The VOTOL manual is explicit: "Without CAN: 9600 / With CAN: 115200." Your error_count is 0, meaning you got no response at all rather than garbled data — which is what a baud mismatch looks like. Worth trying 115200 before anything else.

What I've confirmed since:

1. It is an EM50SP, CAN version. Vincent at SiAECOSYS/QS Motor confirmed by email: "the controller we offer to PHAT is EM50SP controller with CAN bus version." (Damon initially told me it wasn't their product — worth pushing past that.)

2. Measured 121.3 Ω between pins 14 and 15 of the 16-pin main connector, battery disconnected. That's a CAN termination resistor, so those pins are confirmed as the bus.

3. PHAT recolored the entire harness. This is the thing that wasted me a week. The factory colors (orange = pin 14, blue = pin 15) do not exist on this scooter. On mine:

pin 14 (CAN-L) = purple/white, which becomes solid white after a 9-pin connector
pin 15 (CAN-H) = blue/white, which becomes solid brown
pin 16 (e-lock) = thick orange → runs to the JD2912 relay
Don't hunt by wire color. Read the position numbers molded into the white 16-pin housing. I validated the map five ways: pin 16 → the relay, pins 6/7/8 → the throttle 3-pin, pins 14/15 + 2 → a 9-pin at the dash, pin 1 → the rear brake. All matched the factory pinout.

4. There is no debug pigtail — PHAT omitted it, same as yours. But the official EM30SP/50SP/100SP/150SP wiring sheet shows the 4-pin debug port is just a breakout of pins 8/11/14/15. So tapping 14/15 directly is the same net, not a workaround. Dongle is USB-powered, so only the two CAN wires are needed — do not connect pin 8 (+5V).

5. Cable. SiAECOSYS sells three. Their chart splits by generation, not name: "New version" is the -2/-4 series; "Old version" (plain black plug, exactly two wires, red/orange + blue) covers EM50P/EM100SP/EM150SP — i.e. first-gen SP, which is us. I ordered the "Old version Cable" from e-smartway ($33).

Still to try when it arrives (posting these in case anyone can confirm or rule out):

115200 with CAN enable
Swapping CAN-H/CAN-L — the manual notes some models need them exchanged
The ~ + Shift advanced page, using Auto_B for the CAN baud
Making sure the controller is properly woken via the e-lock line before connecting
Cable hasn't landed yet so I haven't actually connected — no success to report. Will update either way.

Goal is the same as Tommy's: restore the factory high gear. These shipped as 8 / 13 / 19.8 mph and the courses locked the middle. 13 ÷ 19.8 = 65.7%, which smells like a Speed ratio somebody typed in.

If anyone has an EM50SP .ini or has connected to one over CAN, I'd love to hear it.