Lantronix XPORT PROTM 900-560 - Manual (Page 100)

11: Modbus
XPort Pro User Guide 100
Serial Transmission Mode
Evolution products can be set up to communicate on standard Modbus networks using either RTU
or ASCII. Users select the desired mode and serial port communication parameters (baud rate,
parity mode, etc) during the line configuration.
Table 11-4 Modbus Transmission Modes
The Modbus web pages allow you to check Modbus status and make configuration changes. This
chapter contains the following sections:
 Modbus Statistics
 Modbus Configuration
Force
Multiple
Coil 0x0F Echo query Echo query Echo query Echo
query N/A N/A N/A
Preset
Multiple
Registers 0x10 Echo query Echo query Echo query Echo
query N/A N/A N/A
Read/
Write 4X
Registers 0x17 0x02-0x06
(Quantity of
Read) * 2
Max [6]..
0x00, 0x0Y
0x00 ,0x0Y
0x00, 0x0Y
Y = 0 or 1
RTU ASCII
 Address: 8 bits (0 to 247 decimal, 0 is used
for broadcast)
 Function: 8 bits (1 to 255, 0 is not valid)
 Data: N X 8 bits (N=0 to 252 bytes)
 CRC Check: 16 bits
 Address: 2 CHARS
 Function: 2 CHARS
 Data: N CHARS (N=0 to 252 CHARS)
 LRC Check: 2 CHARS
Name Number Byte
Count Data [0] Data [1] Data
[2] Data [3] Data
[4] Data [5]