Impulse 463N - Manual (Page 51)

©Sealevel Systems, Inc.
SL9049 - 11/2010
SeaI/O Manual 51
Before configuring SeaI/O modules using MaxSSD, you must first select a device addressing
method. Next, you must properly set termination and pull-up/pull-down resistors. Finally, you
must configure the SeaI/O modules one at a time before MaxSSD and any subsequent applications
(using the SeaMAX API) will be able to successfully communicate.
SeaI/O modules have a rotary switch, labeled “ADDR”, located on the left side of the device that is used to
set the device address (slave ID). The default position for all SeaI/O modules is position “0” (zero). Each
SeaI/O module must be set to a unique slave ID in order to properly communicate with the host device, which
can be a computer or Modbus device. The slave ID can be set by hardware using the rotary switch, which is
recommended for most users. The slave ID can also be set in software by leaving the rotary switch at position
“0” and using MaxSSD to set the slave ID. The rotary switch has three functions:
 Set Address (slave ID) via Hardware – If the rotary switch is set to a position between “1”
and “15” (F). The SeaI/O module will then always respond to commands issued at that slave
ID. This is useful when there are fewer than 16 SeaI/O modules in a chain and the slave ID
is not required to change. This method is recommended for most users.
 Set Address (slave ID) via Software – If the rotary switch is left in the “0” (zero) position,
the SeaI/O module uses a default slave ID of 247 for communications. By using MaxSSD (or
the SeaMAX libraries), it is possible to set the slave ID to a software address between 1 and
247. This is useful when there are more than 16 SeaI/O modules in a chain, or when the
slave ID of a module needs to be frequently changed.
 Hardware Reset – If you have an existing SeaI/O module set to an unknown slave ID or
baud rate, you may wish to reset the device. If the rotary switch is rotated clockwise one
full revolution, the SeaI/O module will be reset to factory defaults (slave ID 247, 9600 bps,
and no parity).
A Hardware Reset will not reset the communication rate of Ethernet (E-series) and Wireless
(E-series) modules. Rotate the rotary switch clockwise one full revolution, and then use the
MaxSSD utility to broadcast a set baud rate command to 9600 bps and no parity.