RESI®
Title:
RESI-MBUSxLVL-ETH Manual
Date
Page
of
05.10.2020
21
41
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8.2
MODBUS holding register table for configuration
The following table show the registers for setup of the serial MBUS line.
The module holds internally a list of 16 bit wide holding register. Those registers can be read by the host with
the function READ HOLDING REGISTER (function code: 3). If the register can also be modified by the host,
the host can use the functions PRESET SINGLE REGISTER (function code: 6).
The MODBUS convention defines 65535 possible holding register with the notation 4x00001 to 4x65536.
Please refer the software MODBUS POLL as a sample for this notation. Internally in the MODBUS/RTU
frames an index notation is used, which starts with 0 and ends with 65535. So we decided to note in the
following document a register with: 4x00100 for the holding register 100, and in addition also the real index of
the protocol index 99 with the notation I:99. Also we have added the hexadecimal number of the real index
with H:0xNNNN.
HINT: Standard unit ID for internal configuration is 254. You can change this unit ID with a special holding
register!
Register
Description
4x65521
I:65520
H:0xFFF0
R/W
RESET SYSTEM
If the host writes the value 1 (0x0001) to this register, the module executes a soft
reset (reboot).
Reading this register will always return 0.
4x65522
I:65521
H:0xFFF1
R/W
STANDARD
CONFIG
With this register you can select various standard configurations for the serial
MBUS line:
Reading this register will always return 0.
Write the following value to select the serial MBUS configuration you want to use.
The Unit ID for configuration is always set to 254 and the pause time before
entering the configuration mode is set to 2000ms.
10: 300bd, even parity, 8 data bits, 1 stop bit
11: 600bd, even parity, 8 data bits, 1 stop bit
12: 900bd, even parity, 8 data bits, 1 stop bit
13: 1200bd, even parity, 8 data bits, 1 stop bit
14: 2400bd, even parity, 8 data bits, 1 stop bit
15: 4800bd, even parity, 8 data bits, 1 stop bit
16: 9600bd, even parity, 8 data bits, 1 stop bit
17: 19200bd, even parity, 8 data bits, 1 stop bit
18: 38400bd, even parity, 8 data bits, 1 stop bit
19: 57600bd, even parity, 8 data bits, 1 stop bit
HINT: You have to perform a reset to activate the new serial configuration!
