Multilin SR469 - Real Time Clock; Default Messages

4. SETPOINT PROGRAMMING S1 SR469 SETUP
4-7
FUNCTION:
The SR469 is equipped with 3 serial communications ports supporting a subset of Modbus RTU protocol. The front panel RS232 has a
fixed baud rate of 9600, a fixed data frame of 1 start/8 data/1stop/no parity. The front port is intended for local use only and will respond
regardless of the slave address programmed. The front panel RS232 program port may be connected to a personal computer running
the 469SETUP program. This program may be used for downloading and uploading setpoint files, or, it may be used to reprogram the
SR469 software to the latest revision.
For RS485 communications, each SR469 must have a unique address from 1-254. Address 0 is the broadcast address which all relays
listen to. Addresses do not have to be sequential but no two units can have the same address or conflicts resulting in errors will occur.
Generally each unit added to the link will use the next higher address starting at 1. Baud rates can be selected as 300,1200, 2400, 4800,
9600, or 19200. The data frame is fixed at 1 start, 8 data, and 1 stop bits, while parity is optional. The computer RS485 port is a general
purpose port for connection to a DCS, PLC, or PC. The Auxiliary RS485 port may be used for redundancy or, it may be used to talk to
Auxiliary Multilin Devices in the future.
4.2.4 REAL TIME CLOCK
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FUNCTION:
For events that are recorded by the event recorder to be correctly time/date stamped, the correct time and date must be entered. A bat-
tery backed internal clock runs continuously even when power is off. It has the same accuracy as an electronic watch approximately +/-
1 minute per month. It must be periodically corrected either manually through the front panel or via the clock update command over the
RS485 serial link. If the approximate time an event occurred without synchronization to other relays is sufficient then entry of time/date
from the front panel keys is adequate.
If the RS485 serial communication link is used then all the relays can keep time in synchronization with each other. A new clock time is
pre-loaded into the memory map via the RS485 communications port by a remote computer to each relay connected on the communica-
tions channel. The computer broadcasts (address 0) a "set clock" command to all relays. Then all relays in the system begin timing at
the exact same instant. There can be up to 100mS of delay in receiving serial commands so the clock time in each relay is +/- 100mS,
+/- absolute clock accuracy in the PLC or PC. See the chapter on Communications for information on programming the time preload
and synchronizing commands.
4.2.5 DEFAULT MESSAGES
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FUNCTION:
After a period of time, the display will change to the default display messages. Between 1-20 default messages can be selected. If more
than one message is chosen, default messages will automatically scan in sequence changing at a rate determined by the setpoint S1
SR469 SETUP /PREFERENCES /DEFAULT MESSAGE CYCLE TIME. Any Actual Value can be selected for default display. In addi-
tion, up to 5 user programmable messages can be created and displayed (Message Scratchpad). For example, the relay could be set to
alternately scan a motor identification message, the current in each phase and the hottest stator RTD. Default messages that are cur-
rently selected can be viewed in DEFAULT MESSAGES subgroup.