Update README: add UsbGpib adapter, auto-ranging, CSV range columns, display-select docs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -1,18 +1,25 @@
 # HIOKI 3193-10 Power Analyzer Tools
 
-GPIB/USB control tools for the HIOKI 3193-10 power analyzer, built for solar MPPT converter efficiency testing.
+GPIB control tools for the HIOKI 3193-10 power analyzer, built for solar MPPT converter efficiency testing.
+
+## Hardware Setup
+
+- **HIOKI 3193-10** power analyzer with 9600 input units
+- **GPIB-USB adapter**: [UsbGpib](https://github.com/xyphro/UsbGpib) — open-source USB-GPIB adapter
+- **NI-VISA runtime** — provides the VISA layer (`visa32.dll`)
+
+The UsbGpib adapter connects to the HIOKI's rear GPIB port and appears as a USB-TMC device. NI-VISA handles the communication.
 
 ## Requirements
 
 - Python 3.12+
 - [uv](https://docs.astral.sh/uv/) package manager
 - NI-VISA runtime (already installed if `visa32.dll` exists)
-- HIOKI 3193-10 connected via USB
+- UsbGpib adapter connected between PC and HIOKI 3193-10
 
 ## Install
 
 ```bash
-cd C:\dev\hioki_3193-10
 uv sync
 ```
 
@@ -44,9 +51,12 @@ Show instrument identity, installed options, clock, wiring mode, and response sp
 ### `hioki setup-mppt`
 
 One-command setup for MPPT efficiency testing:
-- Ch5: 150V, 10A, DC coupling, SLOW (solar panel input)
-- Ch6: 30V, 50A, DC coupling, SLOW (MPPT converter output)
+- Ch5: V-auto, I-auto, DC coupling, SLOW (solar panel input)
+- Ch6: V-auto, I-auto, DC coupling, SLOW (MPPT converter output)
 - EFF1 = P6/P5 x 100%
+- Display: Ch5 items on left, Ch6 items on right, with EFF1
+
+Both voltage and current auto-range for best accuracy across the full sweep range.
 
 ### `hioki measure [items...]`
 
@@ -65,7 +75,7 @@ uv run hioki measure U1 I1 P1 U2 I2 P2 U3 I3 P3 U4 I4 P4 U5 I5 P5 U6 I6 P6
 
 ### `hioki monitor [items...]`
 
-Continuous text-based monitoring with optional CSV logging.
+Continuous text-based monitoring with optional CSV logging. When logging to CSV, voltage and current ranges are recorded per sample.
 
 ```bash
 # Default 1-second interval
@@ -81,7 +91,7 @@ uv run hioki monitor P5 P6 EFF1
 Options:
 - `-i, --interval` - Seconds between readings (default: 1.0)
 - `-n, --count` - Number of readings, 0 = infinite (default: 0)
-- `-o, --output` - CSV output file path
+- `-o, --output` - CSV output file path (includes U/I range columns)
 
 ### `hioki live [items...]`
 
@@ -100,9 +110,25 @@ uv run hioki live -i 0.5 --history 100 U5 U6 P5 P6 EFF1
 
 Options:
 - `-i, --interval` - Seconds between readings (default: 1.0)
-- `-o, --output` - CSV output file path
+- `-o, --output` - CSV output file path (includes U/I range columns)
 - `--history` - Max data points on graph (default: 300)
 
+### `hioki display-select [items...]`
+
+Configure the instrument's front panel display.
+
+```bash
+# MPPT preset: Ch5 left, Ch6 right, EFF1
+uv run hioki display-select --mppt
+
+# Custom 16-item layout
+uv run hioki display-select U5 I5 P5 U6 I6 P6 EFF1
+```
+
+Options:
+- `-c, --count` - Number of display slots: 4, 8, or 16 (default: 16)
+- `--mppt` - Preset: Ch5 on left, Ch6 on right, with EFF1
+
 ### `hioki efficiency`
 
 Configure efficiency calculation formula.
@@ -139,9 +165,19 @@ uv run hioki send *RST
 
 ## Global Options
 
-- `-a, --address` - VISA address (auto-detects HIOKI USB if omitted)
+- `-a, --address` - VISA address (auto-detects HIOKI if omitted)
 - `--timeout` - Communication timeout in ms (default: 5000)
 
+## CSV Output Format
+
+When using `-o` with `monitor` or `live`, the CSV includes:
+- `timestamp` - Date and time of each reading
+- Measurement values (e.g., `U5`, `I5`, `P5`, `EFF1`)
+- `U<ch>_range` - Active voltage range per channel (e.g., 150, 300)
+- `I<ch>_range` - Active current range per channel (e.g., 0.2, 5, 50)
+
+Range columns help identify auto-range transitions and assess measurement accuracy.
+
 ## Python API
 
 Use the driver directly in your own scripts:
@@ -149,17 +185,17 @@ Use the driver directly in your own scripts:
 ```python
 from hioki3193 import Hioki3193
 
-with Hioki3193("USB0::0x03EB::0x2065::HIOKI_3193-10_140110825_V1.50::INSTR") as meter:
+with Hioki3193("GPIB0::1::INSTR") as meter:
     print(meter.idn())
 
     # Configure
     meter.set_wiring_mode("1P2W")
     meter.set_coupling(5, "DC")
-    meter.set_voltage_range(5, 150)
-    meter.set_current_range(5, 10)
+    meter.set_voltage_auto(5, True)
+    meter.set_current_auto(5, True)
     meter.set_coupling(6, "DC")
-    meter.set_voltage_range(6, 30)
-    meter.set_current_range(6, 50)
+    meter.set_voltage_auto(6, True)
+    meter.set_current_auto(6, True)
     meter.set_response_speed("SLOW")
     meter.set_efficiency(1, "P6", "P5")