Time_Meter - Siemens 7SR45 Argus User Manual

5.2.9.4 Holding Registers (Read Write Registers)
Address Name
40001 Time
NOTE:
In the RTU mode, message frames are separated by a silent interval of at least 3.5 character times. This time
interval is also called t3.5. This t3.5 delay needs to be provided by the Modbus RTU master for response to
another query.
7SR45 Argus Relay follows the below equation for satisfying the silent interval time.
tdelay required = 11 x 3.5/b
Where
11 = bits
b = baud rate in bps
tdelay for 7SR45 = tdelay required + 10 ms tolerance
RTS
TXD
tp
tp ...... Pause time (pause before "RTS = ON")
tv ...... Setup time (transmission delay after "RTS = ON")
tn ...... Hold Time (pause time after sending before "RTS = "tOFF")
ts ...... Hold receiver disabled after "RTS = OFF"
rdis ...... Disable receiver when using half duplex protocol
Note: Only active when "ts = 0"
tp or ts must be equal to tdelay for 7SR45.
© 2018 Siemens Protection Devices Limited
Format

TIME_METER

Data transmission
tv
Figure 2-4 Time Settings for Message Frame
Chapter 4 - 7SR45 Data Communications Definitions
Multiplier
0.000000
tn
rdis
Description
Time
ts
Chapter 4 Page 18 of 20