Lantronix XPort APS: Modbus Protocol User Guide - Page 16

Unit ID to IP Address Lookup Table

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3: Configuring Modbus Swap 4x/0x to get 3x//x (1y) This setting allows the MBF to convert "input" resistor data to "holding" resistor data. It also converts coil and contact data. This feature is useful for Modicon I/O scanners. Unit ID to IP Address Lookup Table Figure 3-2. Unit ID to IP Address Lookup Table These parameters only apply when Modbus Master is selected for the Serial Protocol. The new menu appears like this: Network/IP Settings: IP Address 192.168.100.77 Default Gateway not set --Netmask not set --2) Serial & Mode Settings: Protocol Modbus/RTU,Master(s) attached Serial Interface 9600,8,N,1,RS232 3) Modem Control Settings: RTS Output Fixed High/Active 4) Advanced Modbus Protocol settings: MB/TCP Exception Codes . . . . Yes (return 0x0A and 0x0B) Char, Message Timeout . . . . 00050msec, 05000msec 5) Unit ID -> IP Address Table Close Idle Sockets 10sec Redundant Entry Retry . . . . Feature Disabled 7) Security Settings: SNMP Enabled SNMP Community Name . . . . .. public Telnet Setup Enabled TFTP Download Enabled Port 77FEh Enabled Web Server Enabled Web Setup Enabled Enhanced Password Disabled Port 77F0h Enabled D)efault settings, S)ave, Q)uit without save Select Command or parameter set (1. . . 7) to change: Since serial Modbus uses 8-bit slave addresses and a TCP/IP network requires 32-bit IP addresses, the IAP Device Server uses this table to map an 8-bit address into an IP/Unit ID combination. The 8-bit address is used to select the desired IP and as the Unit ID sent. The table holds 8 entries, and any Modbus slave address not found in the table returns an exception response to the master (if enabled). The example below is of adding an entry. Select 5 to edit/view settings. Figure 3-3. Unit ID to Address Lookup Table Example Close Idle TCP sockets after (1-60 sec, 0=leave open) (00010) Redundant entry retries after (15-60 sec. 0=disable feature) (00000) (Set 4th octet to 0 to use Slave Address as part of IP) 1): 001-100: 192.168.000.000+SLV 2): 101-199: 192.168.000.150 A)dd, D)elete, E)xit - select function A Modbus addr from (102) Modbus addr to (102) 255 Modbus Protocol User Guide 16

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3: Configuring Modbus
Modbus Protocol User Guide
16
Swap 4x/0x to get 3x//x (1y)
This setting allows the MBF to convert “input” resistor data to “holding” resistor data. It also
converts coil and contact data. This feature is useful for Modicon I/O scanners.
Unit ID to IP Address Lookup Table
Figure 3-2. Unit ID to IP Address Lookup Table
These parameters only apply when Modbus Master is selected for the Serial
Protocol. The new menu appears like this:
Network/IP Settings:
IP Address . . . . . . . . . . 192.168.100.77
Default Gateway
. . . . . . . --- not set ---
Netmask
. . . . . . . . . . . --- not set ---
2) Serial & Mode Settings:
Protocol . . . . . . . . . . . Modbus/RTU,Master(s) attached
Serial Interface . . . . . . . 9600,8,N,1,RS232
3) Modem Control Settings:
RTS Output . . . . . . . . . . Fixed High/Active
4) Advanced Modbus Protocol settings:
MB/TCP Exception Codes . . . . Yes (return 0x0A and 0x0B)
Char, Message Timeout
. . . . 00050msec, 05000msec
5) Unit ID -> IP Address Table
Close Idle Sockets . . . . . . 10sec
Redundant Entry Retry
. . . . Feature Disabled
7) Security Settings:
SNMP . . . . . . . . . . . . . Enabled
SNMP Community Name . . . . .. public
Telnet Setup . . . . . . . . . Enabled
TFTP Download . . . . .
. . . Enabled
Port 77FEh . . . . . . . . . . Enabled
Web Server . . . . . . . . . . Enabled
Web Setup . . . . . . .
. . . Enabled
Enhanced Password. . . . . . . Disabled
Port 77F0h . . . . . . . . . . Enabled
D)efault settings, S)ave, Q)uit without save
Select Command or parameter set (1. . . 7) to change:
Since serial Modbus uses 8-bit slave addresses and a TCP/IP network requires 32-bit IP
addresses, the IAP Device Server uses this table to map an 8-bit address into an IP/Unit ID
combination. The 8-bit address is used to select the desired IP and as the Unit ID sent. The table
holds 8 entries, and any Modbus slave address not found in the table returns an exception
response to the master (if enabled).
The example below is of adding an entry. Select
5
to edit/view settings.
Figure 3-3. Unit ID to Address Lookup Table Example
Close Idle TCP sockets after (1-60 sec, 0=leave open) (00010)
Redundant entry retries after (15-60 sec. 0=disable feature) (00000)
(Set 4th octet to 0 to use Slave Address as part of IP)
1):
001-100: 192.168.000.000+SLV
2):
101-199: 192.168.000.150
A)dd, D)elete, E)xit - select function
A
Modbus addr from
(102)
Modbus addr
to
(102) 255