Red Lion ITMS - Manual (Page 7)

7
SETPOINT ALARM FIGURES
STEP 6 PROGRAMMING THE ITMS COMMS PORT
MODBUS Protocol: RTU or ASCII
Unit Address: 1-247
Baud Rate: 300, 600, 1200, 2400, 4800, 9600, 19200, or 38400
Data Bits: 7 or 8
Parity: odd, even, or none
Transmit Delay: Programmable from 1-255 milliseconds. The Transmit
Delay is the time the ITMS waits to respond to a serial command,
UNLESS the values in the table are larger.
Note: If the communication settings are changed and then a download is
performed, the module will now respond to the new settings. Any further attempts to communicate to the module
must target the new address, with the new settings. If you do not know or cannot recall the ITMS settings, they
can be reset to factory defaults. Connect the Serial Default terminal to Common, and cycle power. The Defaults
button in the SFIMS software will update the category display to these settings.
Communications Diagnostics: The Communications Diagnostics function can be used to troubleshoot systems that are
experiencing communication errors. Press the Read button to retrieve the diagnostics information. The Commands
Received and the Commands Processed values are automatically reset when the values are read, and at each unit power-up.
Commands Received: The number of messages received that started with the units own address.
Commands Processed: The number of “good” messages received. A “good” message is considered one that contained the
correct unit address, parity, and checksum (CRC or LRC).
BAUD RTU ASCII
38400 2 msec. 2 msec.
19200 3 msec. 2 msec.
9600 5 msec. 2.3 msec.
4800 9 msec. 4.6 msec.
2400 17 msec. 9.2 msec.
1200 33 msec. 18.4 msec.
600 65 msec. 36.7 msec.
300 129 msec. 73.4 msec.