Connecting a DWI-100E batching indicator to a UTE ULP50 thermal printer is a short job, but it only works if three things line up: two wires, the exact output string, and three indicator settings. This is the reference for all three.
Wiring
Two connections only: TXD (pin 2) and GND (pin 5). The indicator sends, the printer receives — there is no return path and none is needed.
The output string
Laid out as it reaches the paper, one line per record:
?
0.00KG
0.00KG
0.00KG
0.00KG
0.00KG
0.00KG
0.00KG
P1,1
Seven weight fields, because the batching cycle reports each ingredient in turn. The same string with its control characters exposed:
Reading the hex
$0D $0A is CR LF, ending each line. $3F is the question mark. FR”01″ calls the stored form and P1,1 prints one copy — both are printer commands rather than weighing data. The three trailing CR LF pairs feed the ticket clear of the tear bar.
Indicator settings
| Parameter | Value |
| P2 | tare |
| FC | 6 |
| PF | form name |
The PF value must match the form name stored in the printer — the name called by FR"01" at the head of the string above. A mismatch here produces a printer that accepts the data and prints nothing, which looks exactly like a wiring fault and is not one.
Peripheral note
KALA Technical Notes
Label printers driven from an indicator rely on a form stored in the printer, so replacing the printer usually means reloading the form as well as rewiring. Tell us the indicator and printer you are pairing and we will supply the string format and the settings.
● Batching indicators, label printers and interface cables.