TM-T20 ESC/POS Quick Reference

TM-T20 ESC/POS Quick Reference
Print Commands
ESC/POS Quick Reference
actual printing.
ESC/POS® Command System
EPSON ESC/POS is a proprietary POS printer command system based on the
escape sequence and includes patented or patent pending commands. ESC/POS is
compatible with most type of EPSON POS printers and displays.
ESC/POS is designed to reduce the processing load on the host computer in POS
environments. It comprises a set of highly functional and efficient commands and
also offers the flexibility to easily make future upgrades.
Aim of the Quick Reference
Quick Reference is a guide to using ESC/POS command to control the printer.
Command Notation
• RT : real-time command (executed as soon as received)
• fn= : function number of the command
• Numbers are written in decimal numeral.
• n specifies 1 byte parameter in the range 0–255.
• nL, nH specify 1 word (2 bytes) parameter as (nL+ n×256) in the range
0–65,535.
• pL, pH specify the number of parameters after pH as (pL+pH×256) in the range
1–65,535
• p1, p2, p3, p4 specify the number of parameters after p4 as
(p1+p2×256+p3×65,536+p4×16,777,216) in the rage 1–4,294,967,295.
• kc1, kc2 specify key code (2 bytes) of NV graphics or download graphics. Each
range of kc1 and kc2 is 32–126.
• Control codes are as follows:
name
code
NUL
0
EOT
4
ENQ
5
HT
9
LF
10
FF
12
CR
13
DLE
16
DC4
20
CAN
24
ESC
27
FS
28
GS
29
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The contents of this document are subject to change without notice. Please contact us for the latest
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assumes no responsibility for errors or omissions.
Neither is any liability assumed for damages resulting from the use of the information contained
herein.
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third parties for damages, losses, costs, or expenses incurred by the purchaser or third parties as a
result of: accident, misuse, or abuse of this product or unauthorized modifications, repairs, or
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any options or any consumable products other than those designated as Original EPSON Products or
EPSON Approved Products by Seiko Epson Corporation.
EPSON and ESC/POS are registered trademarks of Seiko Epson Corporation in Japan and other
countries/regions.
M00051201
Copyright© 2012 Seiko Epson Corporation. All rights reserved.
Character Commands (continued)
• In page mode, these commands only move the print position and do not execute
LF
Prints data and feeds one line.
CR
Functions the same as LF when auto line feed is enabled.
CR is ignored when auto line feed is disabled or when the
serial interface model is used.
ESC J n
Prints data and feeds paper n dots.
ESC d n
Prints data and feeds paper n lines.
Line Spacing Commands
ESC 2
Selects default line spacing.
ESC 3 n
Sets line spacing to n dots.
Character Commands
ESC SP n
Sets right-side character spacing to n dots.
ESC − n
Selects underline.
ESC E n
Turns emphasized character On or Off.
ESC G n
Turns double-strike character On or Off.
n = 0: underline off, n = 1: 1-dot width, n = 2: 2-dot width
n = odd: On,
n = odd: On,
n = even: Off
n = even: Off
ESC M n
Selects a character font.
GS ! n
Selects character size (height/width magnification).
n = 0, "0": Font A,
ESC ? n
Cancel the user-defined character and return the font
pattern to the resident one for the current font.
ESC t n
Selects page n from the character code table.
n = character code to be cleared the user-defined font
n
0
1
2
3
4
5
11
12
13
14
15
16
17
18
19
20
21
26
30
31
32
33
ESC R n
Upper 4 bits of n: width magnification
Lower 4 bits of n: height magnification
The both can be set 0(×1) to 7(×8)
Turns smoothing On or Off for magnified characters.
GS B n
Turns white/black reverse print On or Off for characters.
ESC { n
Turns upside-down print mode On or Off in standard
mode.
n = odd: On,
n = odd: On,
n = odd: On,
ESC V n
n = even: Off
n = even: Off
n = even: Off
Turns 90° clockwise rotation On or Off for characters in
standard mode.
n = 1, 2, "1", "2": On, n = 0, "0": Off
ESC & 3 c1 c2 [x1 d1...d(3 × x1)]...[xk d1...d(3 × xk)]
Defines user-defined characters for character code: c1 to
c2 of the current font.
x = width of the defined pattern
d1...d(3×x) = pattern data for a character
ESC % n
Selects or cancels user-defined character set.
n = odd: Select,
n = even: Cancel
code table
PC855: Cyrillic
PC861: Icelandic
PC862: Hebrew
PC864: Arabic
PC869: Greek
ISO8859-2: Latin2
ISO8859-15: Latin9
PC1098: Farsi
PC1118: Lithuanian
PC1119: Lithuanian
PC1125: Ukrainian
WPC1250: Latin2
WPC1251: Cyrillic
WPC1253: Greek
WPC1254: Turkish
WPC1255: Hebrew
WPC1256: Arabic
WPC1257: Baltic Rim
WPC1258: Vietnamese
KZ-1048: Kazakhstan
User-defined page
Selects an international character set by n.
n
0
1
2
3
4
5
6
7
8
n = 1, "1": Font B
GS b n
n
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
255
code table
PC437: USA, Standard Europe
Katakana
PC850: Multilingual
PC860: Portuguese
PC863: Canadian-French
PC865: Nordic
PC851: Greek
PC853: Turkish
PC857: Turkish
PC737: Greek
ISO8859-7: Greek
WPC1252
PC866: Cyrillic #2
PC852: Latin2
PC858: Euro
KU42: Thai
TIS11: Thai
TIS18: Thai
TCVN-3: Vietnamese
TCVN-3: Vietnamese
PC720: Arabic
WPC775: Baltic Rim
country
USA
France
Germany
U.K.
Denmark I
Sweden
Italy
Spain I
Japan
n
9
10
11
12
13
14
15
16
17
country
Norway
Denmark II
Spain II
Latin America
Korea
Slovenia/ Croatia
China
Vietnam
Arabia
Print Position Commands
HT
Moves print position to the next horizontal tab position.
ESC D n1...nk NUL
Sets tab stops at n1 to nk character columns.
GS L nL nH
Sets left margin in standard mode.
nL + nH×256: number of dots for left margin
GS W nL nH
Sets print area width in standard mode.
nL + nH×256: number of dots for print area width
ESC a n
Aligns all data in one line to the selected layout in
standard mode.
n = 0, "0": Left justification
n = 1, "1": Centering
n = 2, "2": Right justification
NV Graphics Commands (continued)
Print Position Commands (continued)
GS ( L pL pH 48 67 48 kc1 kc2 1 xL xH yL yH 49 d1...dk or
ESC $ nL nH
nL + nH×256: absolute print position
Defines NV graphics data to key code (kc1, kc2).
Moves the print position from current position.
xL + xH×256: number of horizontal dots
yL + yH×256: number of vertical dots
GS ( L 6 0 48 69 kc1 kc2 x y
nL + nH×256: relative print position (-32,768–32,767)
ESC c 5 n
n = odd: Disable,
n = even: Enable
GS ( L 2 0 48 48 or GS ( L 2 0 48 0
Send data: "70" + Size + NUL
Size: "0"–"99999999" [bytes]
GS V m
Executes paper cut.
GS V m n
Executes paper cut after feeding n dots.
m = 0, "0", 1, "1"
GS ( L 2 0 48 51 or GS ( L 2 0 48 3
GS ( L 4 0 48 64 "KC"
nL + nH×256: number of horizontal dots
d: image data (column format)
203 dpi
horizontal
density
203/2 dpi
203 dpi
203/2 dpi
203 dpi
vertical
dots
8 dots
number of d
(= k)
GS ( L 5 0 48 65 "CLR"
nL + nH×256
GS ( L 4 0 48 66 kc1 kc2
GS ( L pL pH 48 112 48 bx by 49 xL xH yL yH d1...dk
fn=112
GS 8 L p1 p2 p3 p4 48 112 48 bx by 49 xL xH yL yH d1...dk
Stores graphics data in the print buffer to the magnified
size specified by bx, by.
bx = 1 or 2: horizontal magnification
by = 1 or 2: vertical magnification
xL + xH×256: number of horizontal dots
yL + yH×256: number of vertical dots
GS ( L 2 0 48 50 or GS ( L 2 0 48 2
fn=66
Download Graphics Commands
fn=83
Converts Windows BMP data and defines download
graphics data to key code (kc1, kc2).
GS ( L pL pH 48 83 48 kc1 kc2 1 xL xH yL yH 49 d1...dk or
fn=83
GS 8 L p1 p2 p3 p4 48 83 48 kc1 kc2 1 xL xH yL yH 49 d1...dk
Defines download graphics data to key code (kc1, kc2).
xL + xH×256: number of horizontal dots
yL + yH×256: number of vertical dots
GS ( L 6 0 48 85 kc1 kc2 x y
fn=50
Prints graphics data in standard mode.
fn=85
Prints download graphics of key code (kc1, kc2) to the
magnified size specified by x, y.
x = 1 or 2: horizontal magnification
y = 1 or 2: vertical magnification
NV Graphics Commands
GS D 48 67 48 kc1 kc2 48 49 d1...dk
fn=65
Deletes NV graphics data of key code (kc1, kc2).
GS D 48 83 48 kc1 kc2 48 49 d1...dk
Graphics Commands
fn=67
Converts Windows BMP data and defines NV graphics data
to key code (kc1, kc2).
GS ( L 2 0 48 52 or GS ( L 2 0 48 4
fn=52
Transmits the unused capacity of download graphics area.
Send data: "72" + Size + NUL
Size: "0"–"99999999" [bytes]
GS ( L 4 0 48 82 kc1 kc2
fn=82
Deletes download graphics data of key code (kc1, kc2).
Logo Print Commands
• User-defined NV graphics can be set to top or bottom logo.
• Top logo is printed in the events enabled by FS ( E (fn=64).
• Bottom logo is printed when paper cut command is executed.
FS ( E 6 0 62 2 kc1 kc2 a n
fn=62
kc1, kc2: user-defined key code for the logo
a: logo position ("0"=left, "1"=center, "2"=right)
n: number of lines to be removed after the logo print
FS ( E 5 0 63 2 kc1 kc2 a
fn=63
kc1, kc2: user-defined key code for the logo
a: logo position ("0"=left, "1"=center, "2"=right)
Deletes all NV graphics data.
24 dots 3×(nL + nH×256)
fn=81
Deletes all download graphics data.
Sets for bottom logo printing in NV memory.
Send data: "7r" + Is + [kc1,kc2]... + NUL
Is = 65: following send data group exists, Is = 64: not exist
[kc1,kc2]...: strings of key codes (0–80 bytes length)
Stores bit image data in the print buffer.
203/3 dpi
fn=64
Transmits the key code list for defined NV graphics.
ESC ∗ m nL nH d1...dk
GS ( L 5 0 48 81 "CLR"
Sets for top logo printing in NV memory.
Send data: "71" + Size + NUL
Size: "0"–"99999999" [bytes]
Bit Image Commands
0
1
32
33
fn=51
Transmits the unused capacity of NV graphics area.
m = "A" or "B"
vertical
density
fn=48
Transmits the entire capacity of NV graphics area.
Mechanism Control Commands
m
fn=69
x = 1 or 2: horizontal magnification
y = 1 or 2: vertical magnification
Enables or disables the panel buttons.
fn=80
Send data: "7s" + Is + [kc1,kc2]... + NUL
Is = 65: following send data group exists, Is = 64: not exist
[kc1,kc2]...: strings of key codes (0–80 bytes length)
Prints NV graphics of key code (kc1, kc2) to the magnified
size specified by x, y.
Panel Button Commands
GS ( L 4 0 48 80 "KC"
Transmits the key code list for download graphics.
GS 8 L p1 p2 p3 p4 48 67 48 kc1 kc2 1 xL xH yL yH 49 d1...dk
Moves print position from the left edge of print area.
ESC \ nL nH
Download Graphics Commands (continued)
fn=67
FS ( E pL pH 64 2 [a1 n1]...[ak nk]
fn=64
Enables or disables auto top logo printing.
a
function
48 Prints while feeding paper to cut position
64 Prints at power-on
65 Prints when Roll paper cover is closed
66 Prints when buffers are cleared in recovery from error
67 Prints after fed paper with Feed button
n = "0": Disables, n = "1": Enables
FS ( E 4 0 65 2 a n
fn=65
Enables or disables logo printing temporarily.
a = "0": Top logo
a = "1": Bottom logo
n = "0": Enable
n = "1": Disable
FS ( E 3 0 61 2 c
fn=61
Transmits set values for top or bottom logo printing.
c = "0": Set values for top logo
c = "1": Set values for bottom logo
c = "2": Extended set values for top logo
c
send data
"0" "7H202" + kc1 + kc2 + pos + line + NUL
"1" "7H212" + kc1 + kc2 + pos + NUL
"2" "7H222" + fa + fp + fc + fe + ff + NUL
kc1, kc2: user-defined key code for the logo
pos: logo position ("0"=left, "1"=center, "2"=right)
line: number of removed lines after logo print ("0"–"255")
fa, fp, fc, fe, ff: flag for top logo print ("0"=disabled, "1"=enabled)
fa:
while feeding to cut position
fp:
at power-on
fc:
when cover closed
fe:
when recovered from error with buffer clear
ff:
when fed paper by switch
Logo Print Commands (continued)
Two-Dimensional Code Commands (continued)
FS ( E 6 0 60 2 c "CLR"
fn=60
Clears set values in NV memory for top or bottom logo
printing.
c = "0": Top logo, c = "1": Bottom logo
Store symbol data in
memory
Bar Code Commands
GS k m d1...dk NUL
Prints bar code. NUL terminates the data.
m
0
1
2
3
4
5
6
bar code system
UPC-A
UPC-E
JAN13 / EAN13
JAN8 / EAN8
CODE39
ITF
CODABAR (NW-7)
number of d (=k)
11 or 12
6, 7, 8, 11 or 12
12 or 13
7 or 8
1 or more
even
2 or more
GS k m n d1...dn
Prints bar code. n specifies the data length.
m
"A"
"B"
"C"
"D"
"E"
"F"
"G"
"H"
"I"
"J"
"K"
"L"
"M"
"N"
bar code system
UPC-A
UPC-E
JAN13 / EAN13
JAN8 / EAN8
CODE39
ITF
CODABAR (NW-7)
CODE93
CODE128
GS1-128
GS1 DataBar Omnidirectional
GS1 DataBar Truncated
GS1 DataBar Limited
GS1 DataBar Expanded
GS h n
Sets bar code height to n dots.
GS w n
Sets bar width of bar code.
number of d (=k)
11 or 12
6, 7, 8, 11 or 12
12 or 13
7 or 8
1 or more
even
2 or more
1–255
2–255
2–255
13
13
13
2–255
n = 2–6 (thin–thick)
GS H n
Selects print position of HRI characters.
n = 0, "0": Not printed
n = 1, "1": Above the bar code
n = 2, "2": Below the bar code
n = 3, "3": Both above and below the bar code
GS f n
Selects font for the HRI characters.
n = 0, "0": Font A,
n = 1, "1": Font B
Two-Dimensional Code Commands
GS ( k pL pH cn fn [parameters]
Stores, prints symbol data, or configure the settings.
cn = 48: PDF417
49: QR Code
50: MaxiCode
51: 2-dimensional GS1 DataBar
52: composite symbology
function
GS r n
cn
fn
48
49
50
m d1...dk
80
51
81
m (m=48)
Send 2D symbol size
82
m (m=48)
columns
65
n
n1 n2
rows
66
n
module
67
n
row height
68
n
error
correction
69
mn
options
70
m
maximum
width
71
font
72
52
GS a n
n
n
n
n
nL nH
nL nH
n
n
Send data of GS ( k (fn=82):
"7" + Id + X + 31 + Y + 31 + "1" + 31 + Fl + Ec + NUL
Id
X: horizontal dots
Y: vertical dots
Fl: flag
Ec: error code
48
"/"
cn
50
51
52
"7"
"O"
"P"
"0"–"99999"
"0"–"99999"
"0" = printable, "1" = not printable
N/A (0 byte)
"0000"–"9999"
49
"6"
Macro Function Commands
GS :
r:
t:
m = 0:
m = 1:
RT
Transmits real-time status as 1 byte.
n = 1: Printer status (binary: 0000xx00)
bit 2 = 1: Drawer kick-out connector pin 3: High
= 0: Drawer kick-out connector pin 3: Low
bit 3 = 1: in Offline, 0: in Online
n = 2: Offline cause status (0xx0xx00)
bit 2 = 1: Cover is open, 0: closed
bit 3 = 1: on feeding paper by switch, 0: not
bit 5 = 1: Printing stopped due to paper end, 0: not
bit 6 = 1: in Error state, 0: not
n = 3: Error cause status (0xx0x000)
bit 3 = 1: Autocutter error, 0: not
bit 5 = 1: Unrecoverable error, 0: not
bit 6 = 1: Automatically recoverable error, 0: not
n = 4: Paper end sensor status (0xx00000)
bit 5, 6 = 1: Paper end, 0: paper present
Starts or ends macro definition.
GS ^ r t m Executes defined macro.
Status Commands
DLE EOT n
Enables or disables basic ASB (Automatic Status Back).
bit of n Status (1: enable, 0: disable)
0
Drawer kick-out connector status
1
Online/offline status
2
Error status
3
Paper end sensor status
ASB status binary (x=0 or 1)
first byte
0xx1 xx00
bit 2 = 1: Drawer kick-out connector pin 3: High
= 0: Drawer kick-out connector pin 3: Low
bit 3 = 1: in Offline, 0: in Online
bit 5 = 1: Cover is open, 0: closed
bit 6 = 1: on feeding paper by switch, 0: not
2nd byte
0xx0 x000
bit 3 = 1: Autocutter error, 0: not
bit 5 = 1: Unrecoverable error, 0: not
bit 6 = 1: Automatically recoverable error, 0: not
3rd byte
0110 xx00
bit 2, 3 = 1: Paper end, 0: paper present
4th byte
0110 1111
[parameters] (blank = invalid command)
number
of bytes
1
1–5
1–5
1
0 or 4
Transmits status specified by n as 1 byte after completion
of prior print or command.
n = 1, "1": Paper sensor status
Status = 0: Paper end sensor: paper present
Status = 12: Paper end sensor: not present
n = 2, "2": Drawer kick-out connector status
Status = 0: Drawer kick-out connector pin 3: Low
Status = 1: Drawer kick-out connector pin 3: High
m n d1...dk m a b d1...dk
(m=48)
Print 2D symbol
Setting
Status Commands (continued)
repeat times
interval time (×100msec)
repeat continuously
repeat by pressing the Feed button
Miscellaneous Commands
ESC @
Initializes printer.
DLE ENQ n
RT
Recovers from recoverable errors.
n = 1: Recovers and starts printing from the line where the error
occurred
n = 2: Recovers after clearing both receive and print buffers
GS ( D pL pH 20 [a1 b1]...[ak bk]
Enables or disables real-time command.
a = 1: DLE DC4 (fn=1)
a = 2: DLE DC4 (fn=2)
ESC = n
b = 0, "0": Disable
b = 1, "1": Enable
Enables or disables the printer device.
n = 1, 3: Enable,
n = 0: Disable
Miscellaneous Commands (continued)
Miscellaneous Commands (continued)
ESC p m t1 t2
DLE DC4 1 m t
fn=1
RT
DLE DC4 3 0 0 0 1 0
m = 0: connector pin 2, m = 1: connector pin 5
t = 1–8: On time / Off time (×100 ms)
DLE DC4 2 1 8
GS ( H 6 0 48 48 d1 d2 d3 d4
Transmits process ID specified by (d1, d2, d3, d4) after
execution of prior print or command.
66
67
68
69
send data
99
2: supported Multi-byte character
3: not supported
Column emulation "=#0"+NUL: normal mode
mode
"=#1"+NUL: 42 column mode
Firmware version 95+strings+NUL
depends on firmware
Manufacturer
95+"EPSON"+NUL
Printer name
95+"TM-T20"+NUL
Serial number
95+Serial number (10 bytes)+NUL
Type of mounted 95+strings+NUL
additional fonts
depends on printers
ex.) "KANJI JAPANESE"
GS g 0 0 nL nH
50
70
counter
Number of lines fed
Number of head energizations
Number of lines fed (after the print
head was replaced)
Number of autocutter operations
Duration of printer operation
• Page mode is a free layout mode. Any print data can be put in any place on the
print area and be printed by FF or ESC FF command.
ESC L
Switches from standard mode to page mode.
ESC S
Switches from page mode to standard mode.
FF
Prints all data and switches from page mode to standard
mode.
ESC FF
Prints all data in page mode. After printing, the printer
does not clear the buffered data, the print position, and
values set by other commands.
Sets the print area size and the logical origin in page
mode.
unit
lines
times
lines
times
hours
xL + xH×256, yL + yH×256: position of the logical origin
dxL + dxH×256: width of the print area
dyL + dyH×256: height of the print area
ESC T n
Number of lines fed
lines
Number of head energizations
times
Number of lines fed (after the lines
print head was replaced)
Number of autocutter operations times
Duration of printer operation
hours
Send data: 95 + Value + NUL
Value: "0"–"9999999999" (1–10 bytes length)
nL + nH×256
resettable cumulative
20
148
21
149
22
150
50
70
GS ( K 2 0 50 m
Selects print speed.
m = 0, "0": speed customized by GS ( E (fn = 5, a = 6)
m = 1–13 (slow–fast)
178
198
fn=50
Selects the print direction and the starting position in
page mode.
n
0, "0"
1, "1"
2, "2"
3, "3"
Transmits value of resettable or cumulative maintenance
counter.
unit
RT
Page Mode Commands
GS g 2 0 nL nH
counter
fn=8
ESC W xL xH yL yH dxL dxH dyL dyH
Initialize resettable maintenance counter.
nL + nH×256
20
21
22
RT
Clears both receive and print buffers, and transmits 3
bytes: 55, 37, 0, as the Clear response.
Transmits printer ID or printer information.
65
fn=2
DLE DC4 8 1 3 20 1 6 2 8
d=32–126: visible character
Send data: 55 + 34 + d1 + d2 + d3 + d4 + NUL
35
RT
Executes printer power-off sequence and transmits 3
bytes: 59, 48, 0.
fn=48
information
Printer model ID
Type ID
fn=3
Stops sounding optional external buzzer and transmits 4
bytes: 55, 84, 64, 0.
Outputs pulse to Drawer kick-out port in real-time.
GS $ nL nH
print direction
left to right
bottom to top
right to left
top to bottom
starting position
upper left
lower left
lower right
upper right
In page mode, moves the vertical print position from the
starting position set by ESC T.
nL + nH×256: absolute print position
GS \ nL nH
In page mode, moves the vertical print position from the
current position.
nL + nH×256: relative print position (-32,768–32,767)
CAN
Cancels print data in page mode.
• For details, refer to TM-T20 product specification or ESC/POS Application
•
n specifies the sound pattern. (n = 1–7)
c specifies the repeat times. (c = 0: infinitely)
m = 0, "0": connector pin 2, m = 1, "1": connector pin 5
t1: on time (×2ms), t2: off time (×2ms)
n
1, "1"
2, "2"
fn=97
Sounds optional external buzzer.
Outputs pulse to Drawer kick-out port.
GS I n
Other Commands
ESC ( A 3 0 97 n c
Programming Guide for Paper Roll Printers.
OC : obsolete command
Character Commands
ESC !
Selects character font and styles.
Miscellaneous Commands
GS P
GS ( A
Sets horizontal and vertical motion units.
Executes test print.
Bit Image Commands
GS v 0
Prints raster bit image
OC
NV Bit Image Commands
FS q
FS p
Defines NV bit image in NV graphics area.
OC
Prints NV bit image defined by FS q.
OC
Downloaded Bit Image Commands
GS ∗
GS /
Defines downloaded bit image.
OC
Prints downloaded bit image defined by GS ∗
OC
Status Commands
ESC u
ESC v
Transmits peripheral device status as 1 byte.
OC
Transmits status of paper sensor as 1 byte.
OC
Mechanism Control Commands
ESC i
ESC m
Executes paper cut.
OC
Executes paper cut.
OC
Customize Commands
FS g 1
FS g 2
Writes data to NV user memory.
OC
Transmits data in NV user memory.
OC
User Setup Commands
GS ( E (fn=1)
Enters User setting mode and transmits the mode
change notice.
GS ( E (fn=2)
Ends User setting mode and performs software
reset.
GS ( E (fn=3)
GS ( E (fn=4)
GS ( E (fn=5)
GS ( E (fn=6)
GS ( E (fn=11)
GS ( E (fn=12)
GS ( E (fn=15)
GS ( E (fn=16)
Sets memory switch setting values.
Transmits memory switch setting values.
Sets customized setting values.
Transmits customized setting value.
Sets configuration item for serial interface.
Transmits configuration value.
Selects configuration item: Class of USB interface.
Transmits configuration value for Class of USB
interface.
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