DELTA DVP Series PLC
COMMUNICATION PROTOCOL VER 1.0
DELTA ELECTRONICS, INC.
1
1. Communication Interface: RS-232C
2. Communication Protocol ASCII mode, 9600（Baud rate）,7(Data length), EVEN（Parity）,1
（Stop bit）
3. Communication Data Frame
STX
ADR 1
ADR 0
CMD 1
CMD 0
DATA（0）
DATA（1）
……….
DATA（n-1）
LRC CHK 1
LRC CHK 0
END 1
END 0

Start character ‘:’（3AH）
Communication address:
8-bit address consists of 2 ASCII codes
Command code:
8-bit command consists of 2 ASCII codes
Contents of data:
n8-bit data consist of 2n ASCII codes.
n37, maximum of 74 ASCII codes
LRC check sum:
8-bit check sum consists of 2 ASCII codes
End character:
END 1 = CR（0DH），END 0 = LF（0AH）
ADR（Communication Address）
Valid communication addresses are in the range of 0…31. Communication address equals to
0 means broadcast to all PLC, the PLC will reply normal message to the master device.
For example, communication to PLC with address 16 decimal:
(ADR 1, ADR 0)=’1’,’0’’1’=31H, ‘0’ = 30H

CMD (Command code) and DATA (data characters)
The format of data characters depends on the command code. For example, reading
continuous 8 words form starting device address 0614H of PLC with address 01H.
Field Name
Heading
Slave Address
Command code
Starting Address Hi
Starting Address Lo
Number of Points Hi
Number of Points Lo
Error Check ( LRC )
Number of Points(max)
= 18（for 16 bit register）
= 9（for 32 bit register）
Example (Hex)
3A
01
03
06
14
00
08
DA
2
Example：Reading Coils T20~T27 from slave device 01
PC→PLC
“：01 03 06 14 00 08 DA CR LF”
PLC→PC
“：01 03 10 00 01 00 02 00 03 00 04 00 05 00 06 00 07 00 08 B8 CR LF”
Field Name
Slave Address
Command code
Bytes Count
Data Hi（T20）
Data Lo（T20）
Data Hi（T21）
Data Lo（T21）
Data Hi（T22）
Data Lo（T22）
Data Hi（T23）
Data Lo（T23）
Data Hi（T24）
Data Lo（T24）
Data Hi（T25）
Data Lo（T25）
Data Hi（T26）
Data Lo（T26）
Data Hi（T27）
Data Lo（T27）
Error Check（LRC）

Example (Hex)
01
03
10
00
01
00
02
00
03
00
04
00
05
00
06
00
07
00
08
C8
LRC CHK（check sum）
LRC (Longitudinal Redundancy Check) is calculated by summing up, module 256, the values
of the bytes from ADR1 to last data character then calculating the hexadecimal representation
of the 2’s-complement negation of the sum.
3
For example, reading 1 word form address 0401H of the PLC with address 01H
STX
ADR 1
ADR 0
CMD 1
CMD 0
Starting data address
Number of data
LRC CHK 1
LRC CHK 0
END 1
END 0
‘：’
‘0’
‘1’
‘0’
‘3’
‘0’
‘4’
‘0’
‘1’
‘0’
‘0’
‘0’
‘1’
‘F’
‘6’
CR
LF
01H+03H+04H+01H+00+01H = 0AH
the 2’s-complement negation of 0AH is F6H
Exception response:
The PLC is been expected to return a normal response after receiving command messages
from the master device. The following depicts the conditions that no normal response is
replied to the master device.
The PLC does not receive the messages due to a communication error; thus the PLC has no
response. The master device will eventually process a timeout condition.
The PLC receives the messages without a communication error, but cannot handle it, an
exception response will return to the master device. In the exception response, the most
significant bit of the original command code is set to 1, and an exception code explains the
condition that caused the exception is returned.
4
An example of exception response of command code 01H and exception 02H:
Command message:
Field Name
Heading
Slave Address
Function
Starting Address Hi
Starting Address Lo
Number of Points Hi
Number of Points Lo
Error Check ( LRC )
Example (Hex)
3A
01
01
04
00
00
10
EA
Response message:
Field Name
Heading
Slave Address
Function
Exception Code
Error Check ( LRC )
Exception
code:
01
02
03
07
Example (Hex)
3A
01
81
02
7C
Meaning:
Illegal command code:
The command code received in the command message is not
available for the PLC.
Illegal device address:
The device address received in the command message is not
available for the PLC.
Illegal device value:
The device value received in the command message is not
available for the PLC.
Check Sum Error
Check if the check Sum is correct
Illegal command messages
The command message is too short.
Command message length is out of range.
5
 The format of data characters depends on the command. The available command
codes are described as followed,
Code
01
02
03
05
06
15
16
17
Name
Description
Read Coil Status
Read Input Status
Read Holding Registers
Force Single Coil
Preset Single Register
Force Multiple Coils
Preset Multiple Register
Report Slave ID
S, Y, M, T, C
S, X, Y, M,T, C
T, C, D
S, Y, M, T, C
T, C, D
S, Y, M, T, C
T, C, D
None
DELTA DVP-ES Series PLC DEVICE ADDRESS
Device
Range
S
S
S
S
X
Y
T
M
M
M
M
M
000~255
246~511
512~767
768~1023
000~377 (Octal)
000~377 (Octal)
000~255
000~255
256~511
512~767
768~1023
1024~1279
C
000~255
D
D
D
D
D
000~255
256~511
512~767
768~1023
1024~1279
Effective Range
000~127
000~177 (Octal)
000~177 (Octal)
000~127
0000~1279
Address
0000~00FF
0100~01FF
0200~02FF
0300~03FF
0400~04FF
0500~05FF
0600~06FF
0800~08FF
0900~09FF
0A00~0AFF
0B00~0BFF
0C00~0CFF
000~127
232~255
0E00~0EFF
000~599
1000~1143
1000~10FF
1100~11FF
1200~12FF
1300~13FF
1400~14FF
6
Command Code：01, Read Coil Status
Field Name
Heading
Slave Address
Command code
Starting Address Hi
Starting Address Lo
Number of Points Hi
Number of Points Lo
Error Check ( LRC )
Example (Hex)
3A
01
01
06
14
00
25
BF
Number of Points(max) = 255 = 0x00FF
Example：Reading Coils T20~T56 from slave device 01
PC→PLC “：01 01 06 14 00 25 BF CR LF”
PLC→PC “：01 01 05 CD 6B B2 0E 1B D6 CR LF”

Field Name
Example (Hex)
Slave Address
Command code
Bytes Count
Data（Coils T27…T20）
Data（Coils T35…T38）
Data（Coils T43…T36）
Data（Coils T51…T44）
Data（Coils T56…T52）
Error Check（LRC）
01
01
05
CD
6B
B2
0E
1B
E6
Command Code：02, Read Input Status
Field Name
Heading
Slave Address
Command code
Starting Address Hi
Starting Address Lo
Number of Points Hi
Number of Points Lo
Error Check ( LRC )
Example (Hex)
3A
01
02
05
14
00
25
BF
Example：Reading Contact Y024~Y070 from slave device 01
PC→PLC “：01 02 05 14 00 25 BF CR LF”
PLC→PC “：01 01 05 CD 6B B2 0E 1B E5 CR LF”
7
Field Name
Slave Address
Command code
Bytes Count
Data（Coils Y033…Y024）
Data（Coils Y043…Y034）
Data（Coils Y053…Y044）
Data（Coils Y063…Y054）
Data（Coils Y070…Y064）
Error Check（LRC）
Example (Hex)
01
02
05
CD
6B
B2
0E
1B
E5
 Command Code：03, Read Holding Register
Holding Register：T, C, D
Field Name
Heading
Slave Address
Command code
Starting Address Hi
Starting Address Lo
Number of Points Hi
Number of Points Lo
Error Check ( LRC )
Example (Hex)
3A
01
03
06
14
00
08
DA
Number of Points(max)
= 18（for 16 bit register）
= 9（for 32 bit register）
Example：Reading Coils T20~T27 from slave device 01
PC→PLC
“：01 03 06 14 00 08 DA CR LF”
PLC→PC
“：01 03 10 00 01 00 02 00 03 00 04 00 05 00 06 00 07 00 08 B8 CR LF”
Field Name
Slave Address
Command code
Bytes Count
Data Hi（T20）
Data Lo（T20）
Data Hi（T21）
Data Lo（T21）
Example (Hex)
01
03
10
00
01
00
02
8
Data Hi（T22）
Data Lo（T22）
Data Hi（T23）
Data Lo（T23）
Data Hi（T24）
Data Lo（T24）
Data Hi（T25）
Data Lo（T25）
Data Hi（T26）
Data Lo（T26）
Data Hi（T27）
Data Lo（T27）
Error Check（LRC）

00
03
00
04
00
05
00
06
00
07
00
08
C8
Command Code：05, Force Single Coil
Field Name
Heading
Slave Address
Command code
Coil Address Hi
Coil Address Lo
Force Data Hi
Force Data Lo
Error Check ( LRC )
Example (Hex)
3A
01
05
05
00
FF
00
F6
MMNN = 0xFF00….Coil ON
MMNN = 0x0000….Coil OFF
Example：Forcing Coil Y000 ON
PC→PLC “：01 05 05 00 FF 00 F6 CR LF”
PLC→PC “：01 05 05 00 FF 00 F6 CR LF”
Field Name
Heading
Slave Address
Command code
Coil Address Hi
Coil Address Lo
Force Data Hi
Force Data Lo
Error Check ( LRC )
Example (Hex)
3A
01
05
05
00
FF
00
F6
9
10

Command Code：06, Preset Single Register
Field Name
Heading
Slave Address
Command code
Register Address Hi
Register Address Lo
Preset Data Hi
Preset Data Lo
Error Check ( LRC )
Example (Hex)
3A
01
06
06
00
12
34
AD
Example：Setting Register T0 to 00 03
PC→PLC “：01 06 06 00 12 34 AD CR LF”
PLC→PC “：01 06 06 00 12 34 AD CR LF”
Field Name
Heading
Slave Address
Command code
Register T0 Address Hi
Register T0 Address Lo
Preset Data Hi
Preset Data Lo
Error Check ( LRC )
Example (Hex)
3A
01
06
06
00
12
34
AD
Switch ( c )
Case 0：T0
Q →：01 06 06 00 12 34 AD CR LF
Case 1：C0
Q →：01 06 0E 00 12 34 AF CR LF
Case 2：C232
Q →：01 06 0E E8 12 34 56 78 EF CR LF
Case 3：D10
Q →：01 06 10 0A 12 34 99 CR LF
Case 4：D1000
Q →：01 06 13 E8 12 34 BA CR LF
11

Command Code：15, Force Multiple Coils
Field Name
Heading
Slave Address
Command code
Coil Address Hi
Coil Address Lo
Quantity of Coils Hi
Quantity of Coils Lo
Byte Count
Force Data Hi
Force Data Lo
Error Check (LRC)
Example (Hex)
3A
01
0F
05
00
00
0A
02
CD
01
11
Quantity of Coils (max) = 255
Example：Setting Coil Y007…Y000 = 1100 1101, Y011…Y010 = 01.
PC→PLC “：01 0F 05 00 00 0A 02 CD 01 11 CR LF”
PLC→PC “：01 0F 05 00 00 0A E1 CR LF”
Field Name
Heading
Slave Address
Command code
Register T0 Address Hi
Register T0 Address Lo
Preset Data Hi
Preset Data Lo
Error Check ( LRC )
Example (Hex)
3A
01
0F
05
00
00
0A
E1
12

Command Code：16, Preset Multiple Register
Field Name
Heading
Slave Address
Command code
Starting Address Hi
Starting Address Lo
Number of Register Hi
Number of Register Lo
Byte Count
Data Hi
Data Lo
Data Hi
Data Lo
Error Check (LRC)
Example (Hex)
3A
01
10
06
00
00
02
04
00
0A
01
02
C6
Number of Register(max)
= 16（for 16 bit register）
= 8（for 8 bit register）
Example：Setting Register T0 to 00 0A, T1 to 01 02.
PC→PLC “：01 10 06 00 02 00 04 00 0A 01 02 D6 CR LF”
PLC→PC “：01 10 06 00 00 02 E7 CR LF”
Field Name
Example (Hex)
Heading
Slave Address
Command code
Starting Address Hi
Starting Address Lo
Number of Registers Hi
Number of Registers Lo
Error Check ( LRC )
3A
01
10
06
00
00
02
E7
13

Command Code：17, Report Slave ID
Returns a description of controller present at the slave address, the current status of the slave
Run indicator, and other information specific to the slave device.
Command message:
Field Name
Heading
Slave Address
Command code
Error Check (LRC)
Example (Hex)
3A
01
11
EE
Response message:
Field Name
Example (Hex)
Heading
Slave Address
Command code
Byte Count
Slave ID
Run Indicator Status
00 = OFF
FF = ON
Data 0（D1001 HI）
Data 1（D1001 LOW）
Error Check (LRC)
3A
01
11
04
01
FF
40
10
9A
14

DVP Series PLC Internal Device Communication Address
Effective range
Device
S
S
S
S
X
Y
T
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
C
Range
000~255
246~511
512~767
768~1023
000~377 (Octal)
000~377 (Octal)
000~255
000~255
256~511
512~767
768~1023
1024~1279
1280~1535
1536~1791
1792~2047
2048~2303
2304~2559
2560~2815
2816~3071
3072~3327
3328~3583
3584~3839
3840~4095
0~199 16-bit
200~255 32-bit
Type
bit
bit
bit
bit
bit
bit
bit/word
bit
bit
bit
bit
bit
bit
bit
bit
bit
bit
bit
bit
bit
bit
bit
bit
bit/word
bit/Dword
Address
0000~00FF
0100~01FF
0200~02FF
0300~03FF
0400~04FF
0500~05FF
0600~06FF
0800~08FF
0900~09FF
0A00~0AFF
0B00~0BFF
0C00~0CFF
0D00~0DFF
B000~B0FF
B100~B1FF
B200~B2FF
B300~B3FF
B400~B4FF
B500~B5FF
B600~B6FF
B700~B7FF
B800~B8FF
B900~B9FF
0E00~0EC7
0EC8~0EFF
15
ES/EX/SS
SA/SX/SH
EH
0~127
0~1023
0~1023
0~177
0~177
000~377
0~127
000~255
000~255
0~1279
0~4095
0000~4095
0~127
232~255
0~199
200~255
0~199
200~255
Effective
Device
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
Range
000~256
256~511
512~767
768~1023
1024~1279
1280~1535
1536~1791
1792~2047
2048~2303
2304~2559
2560~2815
2816~3071
3072~3327
3328~3583
3584~3839
3840~4095
4096~4351
4352~4607
4608~4863
4864~5119
5120~5375
5376~5631
5632~5887
5888~6143
6144~6399
6400~6655
6656~6911
6912~7167
7168~7423
7424~7679
7680~7935
7936~8191
8192~8447
8448~8703
8704~8959
8960~9215
9216~9471
9472~9727
9728~9983
9984~9999
Type
word
word
word
word
word
word
word
word
word
word
word
word
word
word
word
word
word
word
word
word
word
word
word
word
word
word
word
word
word
word
word
word
word
word
word
word
word
word
word
word
Address
1000~10FF
1100~11FF
1200~12FF
1300~13FF
1400~14FF
1500~15FF
1600~16FF
1700~17FF
1800~18FF
1900~19FF
1A00~1AFF
1B00~1BFF
1C00~1CFF
1D00~1DFF
1E00~1EFF
1F00~1FFF
9000~90FF
9100~91FF
9200~92FF
9300~93FF
9400~94FF
9500~95FF
9600~96FF
9700~97FF
9800~98FF
9900~99FF
9A00~9AFF
9B00~9BFF
9C00~9CFF
9D00~9DFF
9E00~9EFF
9F00~9FFF
A000~A0FF
A100~A1FF
A200~A2FF
A300~A3FF
A400~A4FF
A500~A5FF
A600~A6FF
A700~A70F
16
ES/EX/SS
SA/SX/SC
EH
0~1311
0~4999
0000~9999