B&B Electronics GW-7552 - Manual - Manual (Page 40)

GW-7552 PROFIBUS/MODBUS GATEWAY User Manual (Version 1.40, Apr/2012) PAGE: 40
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Control bit(byte 1)
DC(bit 0)：When this bit is set (DC=1), diagnostic messages send by the
GW-7552 module will all be cleared.
SM(bit 1)：When this bit is set (SM=1), the GW-7552 will enter setup
mode. The utility can communicate with the GW-7552 in
this mode.
When this bit is ''0'' (SM=0), the GW-7552 will enter normal
operation mode. The GW-7552 can communicate with
Modbus device in this mode.
Bit 2~7：The remaining bits have to be set to zero.
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Output module select(byte 2)
When this byte is ‘0’ and the user change data output command(byte 0),
it will trigger all data output command of output modules.
When this byte isn’t ‘0’ and the user change data output command(byte
0), it will trigger single data output command of the output module and
this byte
represent module address of the output module (ex: “byte 2”=3, it
represent that the user want to trigger data output command of the third
module )
4.7 Establish connection with GW-7552
Before establishing a connection between the DP-Master and the GW-7552, user
should execute the following steps first.