multiIO / Supported devices / A&D
A&D indicators
Nine indicators across three format cores. A&D's standard data format is the same 16-character frame in every manual that prints it — what differs is whether the model labels the value it sends.
9
Models
3
Output formats
11
Catalogue entries
Three further A&D manuals in our set — the AD-8922A, AD-4532B and SW-D — document no serial format at all, so nothing is catalogued for them.
Models and the formats they offer
| Model | Output formats | Default baud |
|---|---|---|
| AD-4401A | A&D standard ★ | 2400 |
| AD-4402 | A&D standard · General/jet stream ★ | 2400 |
| AD-4404 | A&D standard · General/jet stream ★ | 2400 |
| AD-4406A | A&D standard ★ | 2400 |
| AD-4407A | A&D standard ★ | 2400 |
| AD-4412-CW | A&D format ★ | 2400 |
| AD-4413-CW | A&D format ★ | 2400 |
| AD-4421 | A&D standard ★ | 2400 |
| FS-D | A&D format ★ | 2400 |
The formats
Each one is a separate parser, because which format a site chose is not reliably detectable from the stream — you pick what the box's own menu is set to. Example frames below are produced by that format's own encoder and read back through its own parser.
A&D standard
A&D standard data format
The multi-value form, carrying a weight-type header so a single stream can label its value gross, net, tare or preset tare. A stability header, a type header, eight characters of signed data with the decimal point embedded, and a unit.
Out of range replaces the digits with spaces, so an out-of-range frame carries no value at all — we report the range status rather than inventing a number. Several models can also be configured to send a shorter two-character type header, which parses identically. The AD-4401A and AD-4421 additionally document a totals line, which those two models enable.
Example frame — AD-4401A, a stable 12.34 kg gross reading
ST,GS,+0012.34kg<CR><LF>
53 54 2C 47 53 2C 2B 30 30 31 32 2E 33 34 6B 67 0D 0A
18 bytes · decodes back to 12.34 kg
Verified against: AD-4402 §8.2.5 · AD-4404 §9.2.6 · AD-4401A §12.5 · AD-4421 §13.5 · AD-4406A and AD-4407A §13.2
A&D format
A&D format — the single-value instruments
The same header, data and unit shape but with no weight-type header, because these models stream one displayed value. The AD-4412-CW manual calls it simply "A&D Format" and pins it at 15 characters excluding the terminator.
⚠ The two manuals differ on out-of-range and neither reading is guessed at: the AD-4412-CW sends a literal overflow token in place of the data and unit, while the FS-D blanks or saturates the digits. Either way the header says out of range, so the parser reports the status and publishes no weight — an overflow marker is not a measurement and must never be parsed as one.
Example frame — AD-4412-CW, a stable 12.34 kg gross reading
ST,+00012.340kg<CR><LF>
53 54 2C 2B 30 30 30 31 32 2E 33 34 30 6B 67 0D 0A
17 bytes · decodes back to 12.34 kg
Verified against: AD-4412-CW §9.25 · FS-D OP-03 RS-232C section
General/jet stream
General data format — command and jet stream mode
A batching-oriented frame: the command that produced it is echoed back, along with the material or recipe code and a block of process status. Sent by the AD-4402 and AD-4404 in command mode and jet stream mode.
⚠ Two deliberate limitations. The weight field carries no decimal point, so the scale's decimal places are a configuration fact the frame does not transmit — the value is published exactly as sent, and an install that knows its indicator's setting can scale it. And the 36 documented status flags are published as raw characters rather than decoded, because the manual conveys which character carries which group only through leader lines on a diagram. That is also why this format reports no stability flag: stability is one of those bits.
Example frame — AD-4402, a stable 12.34 kg gross reading
RGRS0000,0000012,000000000<CR><LF>
52 47 52 53 30 30 30 30 2C 30 30 30 30 30 31 32 2C 30 30 30 30 30 30 30 30 30 0D 0A
28 bytes · decodes back to 12 kg
Verified against: AD-4402 §8.2.4 · AD-4404 §9.2.5
Is your indicator here?
If it is, it works out of the box — pick the model and the format its menu is set to, and readings publish over MQTT, Modbus TCP, OPC UA, REST and six more transports at once. If it is not, describe the line's fields in the console and multiIO decodes it anyway, or send us the manual's serial chapter: that is how most of this catalogue got here.