Impulse 463N - Manual (Page 78)

©Sealevel Systems, Inc.
SL9049 - 11/2010
SeaI/O Manual 78
Disabling the Rotary Address Switch and Limiting Software Address Range Selection is not
available on older SeaI/O units (Before Firmware Version 2). In addition, the following
modules do not support it:
 462
 463
 470
As noted earlier, rotating the rotary switch from a non-zero address to the address zero
position will reset the unit to the default state of address 247 and 9600 baud. There are many
situations where this is not desirable. In the event you wish to disable the rotary switch or
simply limit the range of software selectable addresses that may be set, you can do so by
sending the “WriteMultipleRegisters (function 0x16)” MODBUS command to the unit. Address
300 (decimal) should contain the low order byte of the lowest address the unit will accept.
Address 301 will contain the high order byte. Once this command has been issued, the rotary
switch will be completely ignored by the firmware.
To reset the unit to “normal” operation, you can issue the MODBUS “Broadcast Reset Message
(function 0x19).
This setting can also be configured through MaxSSD under the “Range Configuration” tab,
shown below on the next page.