Emerson E300 Series - Page 120

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Parameters
Diagnostics Optimization CT MODBUS RTU Technical Data
120 E300 Design Guide
Issue Number: 1
Serial Mode (M02)
This parameter defines the data format used by the EIA485 comms port on the drive.
The bits in the value of Serial Mode (M02) define the data format as follows.:
Bit 3 is always 0 in the core product as 8 data bits are required for MODBUS RTU.
Bit 2 selects either standard or modified register mode. The menu and parameter numbers are derived for each mode as given in the table below.
Standard mode is the default setting and allows up to 99 parameters to be accessed within a menu. Modified mode is provided to allow register
numbers up to 255 to be addressed.
This parameter can be changed via the drive keypad, or via the comms interface itself. Changing the parameters does not immediately change the
serial communications settings. See note below for more details.
Serial Baud Rate (M03)
This parameter defines the baud rate used by the serial comms interface.
Changing the parameters does not immediately change the serial communications settings. See note below for more details.
Value Text
0 (Default) 8 2 NP
18 1 NP
28 1 EP
38 1 OP
48 2 NP M
58 1 NP M
68 1 EP M
78 1 OP M
87 2 NP
97 1 NP
10 7 1 EP
11 7 1 OP
12 7 2 NP M
13 7 1 NP M
14 7 1 EP M
15 7 1 OP M
Bits 3 2 1 and 0
Format
Number of
data bits
0 = 8 bits
1 = 7 bits
Register mode
0 = Standard
1 = Modified
Stop bits and Parity
0 = 2 stop bits, no parity
1 = 1 stop bit, no parity
2 = 1 stop bit, even parity
3 = 1 stop bit, odd parity
Register mode Register address
Standard
(M x 100) + pp -1
Where M is the effective menu number (A = 0, B = 1, C = 2 etc.) ≤ 162 and pp ≤ 99
Modified
(M x 100) + ppp -1
Where M is the effective menu number (A = 0, B = 1, C = 2 etc.) ≤ 63 and ppp ≤ 255
Value Text
0300
1600
21200
32400
44800
59600
6 (Default) 19200
7 38400
8 57600
9 76800
10 115200