GPIB Commands

GPIB Analyzer

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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 4EOT 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 13CR 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 02319 DC3 33 063 51 3 MLA19
14 024 20DC4 DCL 34 064 52 4 MLA20
15 025 21 NAK PPU 35 065 53 5 MLA21
16 026 22 SYN 36 066 546MLA22
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 3F077 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 14298 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 FMTA6 66 146 102f MSA6,PPE,CFG6
47 107 71 G MTA7 67 147 103 g MSA7,PPE,CFG7

48 110 72H 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
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