Agilent U1232A
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The Agilent U123xA are a series of low-cost 6000-count handheld digital multimeters. PC connectivity is via an IR port.
Hardware
- Renesas 78K0/LF3 8-bit microcontroller with 60K flash and 2K RAM on board.
Photos
Multimeter:
Back
PCB, top
White silkscreen (LCD background)
PCB, bottom
PCB detail
Microcontroller
IR-USB cable:
See Multimeter cables#Agilent_U1173A.
IR-bluetooth interface:
See Multimeter cables#Agilent_U1177A.
Protocol
STAT
The STAT? command is used to query the current state of the device. The response is a quoted 21-byte string, like this:
"000000000110L00000000"
| Byte | Value | Meaning |
|---|---|---|
| 1 | Max/min mode | |
| 0 | Off | |
| 1 | On | |
| 2 | Relative measurement. The last value returned from FETC? before this mode was enabled denotes the stored reference value. | |
| 0 | Off | |
| 1 | On | |
| 3 | Trig hold-log | |
| 0 | Off | |
| 1 | On | |
| 4 | Auto hold-log | |
| 0 | Off | |
| 1 | On | |
| 5 | LED flashlight | |
| 0 | Off | |
| 1 | On | |
| 6 | LCD backlight | |
| 0 | Off | |
| 1 | On | |
| 7 | Unknown (always 0) | |
| 8 | Temp/aux mode. When on and rotary switch is in position 5 (capacitance), CONF? returns MV,1,DC, but the value returned from FETC? instead denotes the temperature, in the unit (F or C) according to the meter's configuration.
| |
| 0 | Off | |
| 1 | On | |
| 9 | Unknown (always 0) | |
| 10 | Unknown (always 1) | |
| 11 | Auto power-off (APO) | |
| 0 | Off | |
| 1 | On | |
| 12 | Unknown (always 0) | |
| 13 | Unknown (always L) | |
| 14 | Unknown (always 0) | |
| 15 | Unknown (always 0) | |
| 16 | Rotary switch position | |
| 0 | V/Zlow | |
| 1 | Voltage AC | |
| 2 | Voltage DC | |
| 3 | Resistance | |
| 4 | Diode | |
| 5 | Capacitance | |
| 6 | Current | |
| 7 | Microcurrent | |
| 17 | Continuity mode. When enabled, the value returned from FETC? is either NAN (no continuity) or any real value to denote continuity. | |
| 0 | Off | |
| 1 | On | |
| 18 | Unknown (always 0) | |
| 19 | Unknown (always 0, but briefly 1 at startup) | |
| 20 | Unknown (always 0) | |
| 21 | Unknown (always 0) |