GPIB Commands

GPIB commands are used to manage the GPIB interface system. They include commands such as untalk (UNT), which commands all GPIB devices to stop sourcing data bytes. The IEEE 488 standard also refers to GPIB command bytes as multiline interface messages. The IEEE 488 multiline interface messages are shown in the following table.

In the following table, the first group of columns (hex 00-1F) represents the primary GPIB commands. The next group of columns (hex 20-3F) corresponds to listen addresses (MLA). The listen address of a device is formed by adding hex 20 to the GPIB primary address. The next group of columns (hex 40-5F) correspond to talk addresses (MTA). The talk address of a device is formed by adding hex 40 to the GPIB primary address. (You may need to stretch this window to see the table correctly.)

Multiline Interface Command Messages

Hex	Oct	Dec	ASCII	Msg				Hex	Oct	Dec	ASCII	Msg
00	000	0	NUL					20	040	32	SP	MLA0
01	001	1	SOH	GTL				21	041	33	!	MLA1
02	002	2	STX					22	042	34	"	MLA2
03	003	3	ETX					23	043	35	#	MLA3
04	004	4	EOT	SDC				24	044	36	$	MLA4
05	005	5	ENQ	PPC				25	045	37	%	MLA5
06	006	6	ACK					26	046	38	&	MLA6
07	007	7	BEL					27	047	39	'	MLA7
08	010	8	BS	GET				28	050	40	(	MLA8
09	011	9	HT	TCT				29	051	41	)	MLA9
0A	012	10	LF					2A	052	42	*	MLA10
0B	013	11	VT					2B	053	43	+	MLA11
0C	014	12	FF					2C	054	44	,	MLA12
0D	015	13	CR					2D	055	45	-	MLA13
0E	016	14	SO					2E	056	46	.	MLA14
0F	017	15	SI					2F	057	47	/	MLA15
10	020	16	DLE					30	060	48	0	MLA16
11	021	17	DC1	LLO				31	061	49	1	MLA17
12	022	18	DC2					32	062	50	2	MLA18
13	023	19	DC3					33	063	51	3	MLA19
14	024	20	DC4	DCL				34	064	52	4	MLA20
15	025	21	NAK	PPU				35	065	53	5	MLA21
16	026	22	SYN					36	066	54	6	MLA22
17	027	23	ETB					37	067	55	7	MLA23
18	030	24	CAN	SPE				38	070	56	8	MLA24
19	031	25	EM	SPD				39	071	57	9	MLA25
1A	032	26	SUB					3A	072	58	:	MLA26
1B	033	27	ESC					3B	073	59	;	MLA27
1C	034	28	FS					3C	074	60	<	MLA28
1D	035	29	GS					3D	075	61	=	MLA29
1E	036	30	RS					3E	076	62	>	MLA30
1F	037	31	US	CFE				3F	077	63	?	UNL
40	100	64	@	MTA0				60	140	96	`	MSA0,PPE
41	101	65	A	MTA1				61	141	97	a	MSA1,PPE,CFG1
42	102	66	B	MTA2				62	142	98	b	MSA2,PPE, CFG2
43	103	67	C	MTA3				63	143	99	c	MSA3,PPE,CFG3
44	104	68	D	MTA4				64	144	100	d	MSA4,PPE,CFG4
45	105	69	E	MTA5				65	145	101	e	MSA5,PPE,CFG5
46	106	70	F	MTA6				66	146	102	f	MSA6,PPE,CFG6
47	107	71	G	MTA7				67	147	103	g	MSA7,PPE,CFG7
48	110	72	H	MTA8				68	150	104	h	MSA8,PPE,CFG8
49	111	73	I	MTA9				69	151	105	i	MSA9,PPE,CFG9
4A	112	74	J	MTA10				6A	152	106	j	MSA10,PPE,CFG10
4B	113	75	K	MTA11				6B	153	107	k	MSA11,PPE,CFG11
4C	114	76	L	MTA12				6C	154	108	l	MSA12,PPE,CFG12
4D	115	77	M	MTA13				6D	155	109	m	MSA13,PPE,CFG13
4E	116	78	N	MTA14				6E	156	110	n	MSA14,PPE,CFG14
4F	117	79	O	MTA15				6F	157	111	o	MSA15,PPE,CFG15
50	120	80	P	MTA16				70	160	112	p	MSA16,PPD
51	121	81	Q	MTA17				71	161	113	q	MSA17,PPD
52	122	82	R	MTA18				72	162	114	r	MSA18,PPD
53	123	83	S	MTA19				73	163	115	s	MSA19,PPD
54	124	84	T	MTA20				74	164	116	t	MSA20,PPD
55	125	85	U	MTA21				75	165	117	u	MSA21,PPD
56	126	86	V	MTA22				76	166	118	v	MSA22,PPD
57	127	87	W	MTA23				77	167	119	w	MSA23,PPD
58	130	88	X	MTA24				78	170	120	x	MSA24,PPD
59	131	89	Y	MTA25				79	171	121	y	MSA25,PPD
5A	132	90	Z	MTA26				7A	172	122	z	MSA26,PPD
5B	133	91	[	MTA27				7B	173	123	{	MSA27,PPD
5C	134	92	\	MTA28				7C	174	124	|	MSA28,PPD
5D	135	93	]	MTA29				7D	175	125	}	MSA29,PPD
5E	136	94	^	MTA30				7E	176	126	~	MSA30,PPD
5F	137	95	_	UNT				7F	177	127	DEL

Message Definitions

CFE	Configuration Enable
CFG	Configure
DCL	Device Clear
GET	Group Execute Trigger
GTL	Go To Local
LLO	Local Lockout
MLA	My Listen Address
MSA	My Secondary Address
MTA	My Talk Address
PPC	Parallel Poll Configure
PPD	Parallel Poll Disable
PPE	Parallel Poll Enable
PPU	Parallel Poll Unconfigure
SDC	Selected Device Clear
SPD	Serial Poll Disable
SPE	Serial Poll Enable
TCT	Take Control
UNL	Unlisten
UNT	Untalk