DisplayWhen (FIX tag 1083)

charFIX 5.0 SP2

DisplayWhen (tag 1083) is a char field defined in FIX 5.0 SP2. It appears in 10 message types, always optionally. It is an enumerated field with 2 defined values.

At a glance

Tag: 1083
Name: DisplayWhen
Datatype: char
Dialects: FIX 5.0 SP2
Messages: 10
Valid values: 2

What the specification says

Instructs when to refresh DisplayQty (1138).

Descriptions are quoted from the FIX Orchestra sources under the Apache 2.0 licence.

A real message using tag 1083

NewOrderSingle · FIX 5.0 SP2

Tag	Field	Wire value	Meaning
8	BeginString	FIXT.1.1
9	BodyLength	118
35	MsgType	D	NewOrderSingle
49	SenderCompID	BOARTEAM
56	TargetCompID	COUNTERPARTY
34	MsgSeqNum	2
52	SendingTime	20240101-12:00:00.000
11	ClOrdID	ORD-10042
1083	DisplayWhen	1	Immediate (after each fill)
54	Side	1	Buy
60	TransactTime	20240101-12:00:00.000
40	OrdType	1	Market
10	CheckSum	128

Edit and decode it yourself

Shown with | separators for readability. On the wire FIX uses SOH (0x01), an invisible control byte — and because BodyLength and CheckSum are computed over the actual bytes, the two forms have different checksums. Both are valid and both decode here.

Open in the full decoder →

Generated from the FIX 5.0 SP2 dictionary and verified at build time: it parses and validates with no issues. Open the decoder to try your own message.

Valid values

A value outside this list is not a parse error — the message still decodes — but validate() reports it as validate/value-not-in-enum.

Value	Meaning	Symbolic name
1	Immediate (after each fill)	IMMEDIATE
2	Exhaust (when DisplayQty = 0)	EXHAUST

Where tag 1083 appears

Requiredness is a property of the message, not of the field: the same tag can be optional in one message and conditionally required in another.

Message	MsgType	Requiredness	Where in the message
CrossOrderCancelReplaceRequest	t	Optional	inside the DisplayInstruction component
ExecutionReport	8	Optional	inside the DisplayInstruction component
MultilegOrderCancelReplace	AC	Optional	inside the DisplayInstruction component
NewOrderCross	s	Optional	inside the DisplayInstruction component
NewOrderList	E	Optional	inside ListOrdGrp › DisplayInstruction
NewOrderMultileg	AB	Optional	inside the DisplayInstruction component
NewOrderSingle	D	Optional	inside the DisplayInstruction component
OrderCancelReplaceRequest	G	Optional	inside the DisplayInstruction component
TradeCaptureReport	AE	Optional	inside TrdCapRptSideGrp › TradeReportOrderDetail › DisplayInstruction
TradeCaptureReportAck	AR	Optional	inside TrdCapRptAckSideGrp › TradeReportOrderDetail › DisplayInstruction

Wire format

A single character. Most char fields are enumerated, so the value is one of a fixed set rather than arbitrary text. @boarteam/fix keeps the value as a string and, for enumerated fields, reports validate/value-not-in-enum when it is not a defined value.

Read tag 1083 in TypeScript

decode.tsts

import { createFixEngine } from "@boarteam/fix";import { dictionary } from "@boarteam/fix-dict-fix50sp2";const fix = createFixEngine(dictionary);const { message, issues } = fix.parse(raw);const displayWhen = message.fields[1083]?.raw;// e.g. "1" — Immediate (after each fill)// The dictionary also carries the labels:const label = fix.dictionary  .fieldByTag(1083)  ?.enumValues?.find((e) => e.value === displayWhen)  ?.description;

Decode this in your own code

The same engine that produced the decoded example above is an Apache-2.0 npm package with zero runtime dependencies. It runs in Node and in the browser, and parse() returns problems as data instead of throwing.

npm i @boarteam/fix @boarteam/fix-dict-fix50sp2

Try the decoder Source on GitHub