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MODBUS FUNCTION CODES & SUPPORTED CODES
■ COMMUNICATION PARAMETERS
PARAMETERS
Data Mode
Baud Rate
9600 / 19200 / 38400 bps
Parity
Bit Length
Stop Bit
Node Addresses
Floating Point Data
Physical Layer
■ FUNCTION CODES
CODE
01 (0x01)
Read Coil Status
02 (0x02)
Read Input Status
03 (0x03)
Read Holding Register
04 (0x04)
Read Input Register
05 (0x05)
Force Single Coil
06 (0x06)
Preset Single Register
15 (0x0F)
Force Multiple Coils
16 (0x10)
Force Multiple Registers
*1. Based upon Modbus Protocol Reference Guide PI-MBUS-300
■ DATA ADDRESS
Coil (0X)
Input Status (1X)
Input Register (3X)
Holding Register (4X)
I = 16-bit integer, F = 32-bit floating, Bn = n-byte character
*2. Thermocouple input
*3. DC and Potentiometer input
*5. Remote Output Mode SW automatically turned ON when reading
*6. Be sure to scale 0% and 100% after the input type has been changed.
SPECIFICATIONS
DEFAULT
RTU
38400 bps
None / Odd / Even
8
1
1 to 247
Normal / Swapped
RS-485
NAME*
NOTES
1
Reading DO
Reading DI
Writing single DO
Writing multiple DO
ADDRESS
DATA FORMAT
1 – 16
17
18
19
23
1 – 16
17
1 – 2
F
3 – 4
F
5 – 6
F
7
I
8
I
129 – 144
B16
1 – 2
F
3
I
4
I
5
I
6
I
7
I
8
I
9 – 10
I
17 – 18
F
19 – 20
F
21 – 22
F
23 – 24
F
25 – 28
F
29 – 33
B10
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: info@m-system.co.jp
MODIFICATION
RTU
Not modifiable
JXCON Software
Odd
JXCON Software
8
Not modifiable
1
Not modifiable
Hardware Rotary SW for 1 through 15,
1
JXCON Software for 16 through 247 (Rotary SW set to
0).
Normal
JXCON Software
RS-485
Not modifiable
NAME
DO (internal switch)
Operation Mode SW (0 : Programming Mode, 1 : Run Mode)
Cold junction compensation SW (0 : Disable, 1 : Enable)*
Linearization SW (0 : Disable, 1 : Enable)*
Remote output mode SW (0 : Local, 1 : Remote)
DI (internal switch)
Input data error (0 : Normal, 1 : Error)
AI in %
AI in engineering unit
Cold junction temperature (°C, °F or K)*
AI in % *
4
Bit
Status Description
0 – 3
Reserved for system's use
4
1 : ADC Channel 1 Overrange
5
1 : ADC Channel 2 Overrange
6
1 : Burnout Detected
6
1 : ADC Hardware Error Detected
8 – 15
Reserved for system's use
Model No. "M2XUM"
AO in % *
5
AO in % *
*
4,
5
Input type No. *
6
Temperature unit (3 : °C, 4 : °F, 5 : K) *
Burnout type (0 : No Burnout, 1 : Downscale, 2: Upscale)
(Reserved)
#1 output type No. (0 : 0 – 20mA, 1 : ±2.5V, 2 : ±10V) *
(Reserved, integer)
Input 100% scaled value
Input 0% scaled value
Output 100% scaled value (V or A)
Output 0% scaled value (V or A)
(Reserved, 32-bit floating)
Tag No.
*4. 0 – 100% converted into 0 – 20000
*7. Thermocouple and RTD input
M2XUM
2
3
2
7
6
EM-5009 Rev.8 P. 5 / 6
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