Emerson Process Management ControlWave EFM 3808 - Manual (Page 51)

CI-ControlWave EFM Product Features & Overview / 1A-7
• Global time-synchronization
• Time-stamped Alarm reporting
• Historical archive data transfer
• Audit file transfer
• On-line program editing
• Diagnostics
• Communication statistics
1A.4.1.2 Modbus Protocol
Modbus - Modbus is often considered a de-facto standard protocol because broad usage as
either the primary or a secondary offering in many measurement and control related
products. Even with its common use, Modbus protocol actually has many variations.
Consider Modbus RTU and Modbus ASCII, Master & Slave, Serial and TCP/IP Open
Modbus. In addition there are consideration regarding supported function codes, floating
point values and byte order. Bristol Babcock supports the following:
• Modbus serial and TCP/IP Open Modbus (Ethernet)
• Master and Slave
• Modbus RTU and ASCII
• Modes 1 - 7, 8, 15 & 16
• Integer and IEEE 4 byte floating point
1A.4.1.3 Generic Serial Interface
The Generic Serial Interface is a user programmable Master and Slave protocol used to
send and receive messages typically with third party serial ASCII devices. This protocol can
be used to interface with such devices and message boards, card readers and many
measurement devices.