WTI remote power strip: Difference between revisions
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Revision as of 04:07, 2 January 2022
I have a Western Telematics, Inc RPB+ remote power strip. I picked it up on eBay.
It's a power strip with an RS232 port on it.
On the outside:
- 5 switched AC outlets, individually controllable
- Can switch up to 15A on one port, up to 15A for all ports.
- 9 pin RS232 port (use a null modem cable to connect)
- Dip switch for setting baud rate
- An LED for each outlet on the front panel to indicate power on state.
Inside it has:
- a PIC 16C56 microcontroller, in a socket
- 5 nice relays and associated drivers to interface to PIC
- a 555 timer
- an ADM232 on the serial port
- a power supply
A PIC 16C56 has:
- 18 pin DIP
- 1.5K memory
- 25 bytes of RAM (whew! takes my breath away!)
- 1 8-bit timer
- It's OTP = one time programmable
To substitute a flash device I could drop in a 16F628A, then I'd get 3.5k of RAM and 224 bytes of RAM. To do that though I'd need to understand what it's doing. Instead I plan on removing the ADM232, and adding an ESP32-Wrover-IE. I can drill a hole in the front panel to fit an external antenna; otherwise no signal will be going through the aluminum case. This will give me WiFi control of 5 devices.
Normal operation
Manual File:Wti power strip.pdf
There are DIP switches to set serial port rate. I keep it at 9600.
From bellman,
minicom --device /dev/ttyS0
The prompt is RPB+>
The menu should come up. If it does not try typing "/S", that gives you status.
- Dart
The basic command is "/n ON | OFF | BOOT", where "n" is a port number 1-5.
BOOT powers down, pauses, then powers up.
ESP32 operation
The ESP32 will need to have its UART connected to the UART of the RPB+. It will need to interface (I suppose) to Home Assistant on the WiFi side. I will make it look like one device with 5 power switches. I will ignore the "reboot" feature and just support "on" and "off".
It looks like ESPhome can handle all of this, of course. I am starting to think there is not anything I cannot do with ESPhome. There is a "UART Switch" component that does exactly what I need.
PIC 16C56
Datasheet is here
