OPM_STS_400_25A_100_1GB_V011
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GE DE STS: installation and operating manual 1.1 (GB)
Digital Energy
™
Static Transfer Switch
g
Logical address setting
The switches
ADR HIGH
and
ADR LOW
are used to give each device its own unique -within the system-
device number (logical address). The device number may be set within the range from 0 to 255. The number
is set in hexadecimal code.
ADR HIGH
setting refers to higher number tetrad and
ADR LOW
to lower
number tetrad.
Table 10 presents the logical address numbers based on
ADR HIGH
(ADRH) and
ADR LOW
(ADRL) switch
settings.
Transmitted data description
Data transmission from the device to the overall system is performed in accordance with the MODBUS RTU
protocol, where the transmission module is in Slave mode of operation. Register value and its meaning is
presented in table 9 below.
Table 9. Objects map for MODBUS protocol
Word
Byte Bit
Parameter
Format
0 0
0 MANUAL_ON
Logic
1=active
1 RETRANSFER_OFF
Logic
1=active
2 PRIMARY_SOURCE_ON
Logic
0=active
3 SECONDARY_SOURCE_ON
Logic
0=active
4 FAILURE_ALARM
Logic
1=active
5 DISTURBANCE_ALARM
Logic
1=active
6 PRIMARY_SOURCE_OK
Logic
0=active
7 SECONDARY_SOURCE_OK
Logic
0=active
1
8..15
Reserved
Device compatibility with MODBUS standard
The device transmits and receives frames in binary variety of MODBUS standard. Frames are protected by
double byte control sum CRC (first the lower byte is transmitted, then the higher one)
The Module executes the following commands of the protocol:
03
- reading of word block,
01
- reading of bit sequence
