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MRBP.424321.001UM Version 1.0 27/01/2020
Appendix C
Modbus RTU protocol description
Controller:
EMI-SSD-1M
Interface:
RS-485
Setup (default):
19200 baud, 8
–
Even
–
1.
Protocol:
MODBUS RTU with following commands support:
- reading from the device. Command code 0x03 (Read Holding Registers);
- word writing into the device. Command code 0x06 (Write Single Register);
- several words writing into the device. Command code 0x10 (Write Multiple registers).
Comment:
R(READ) - readable;
W(WRITE) - writable;
W*(WRITE)
–
limitedly writable.
Table C.1 - The size of each register is 2 bytes (WORD)
Register
address
Purpose
Description
Access
General information (0x03)
0
Interface RS-485 set-
tings/ Device address
bits 0..3. Exchange via channel RS-485 rate:
0x01 - 1200 baud;
0x02 - 2400 baud;
0x03 - 4800 baud;
0x04 - 9600 baud;
0x05 - 19200 baud;
0x06 - 38400 baud;
0x07 - 57600 baud.
bits 4..5. Parity:
0x00 - None;
0x01 - Odd;
0x02 - Even.
bits 6..7. stop bit:
0x01 - one stop bit;
0x02 - two stop bits.
bits 8..15. Address: 1-247.
R/-
1
EMI-SSD-1M serial
number (upper part)
0x0000 - 0x9999
R/-
2
EMI-SSD-1M serial
number (lower part)
0x0000 - 0x9999
R/-
3
Software version
number
bits 0..3. Software global changes: 0 - 15;
bits 4..15. small Software functionality changes: 0 -
4095;
R/-
4
Software build num-
ber
0…65535
R/-
5
Software date
bits 0..4. Day: 1-31;
bits 5..8. Month: 1-12;
bits 9..15. Year: 0-127(i.
е
. 2000 - 2127).
R/-