Brooks Instrument SLAMf Series - Manual (Page 40)

3-6
Section 3 Operation Installation and Operation Manual
X-TMF-SLAMf-MFC-eng
Part Number: 541B032AAG
April, 2013
Brooks ® Digital MFC's and MFM's
5 Vdc Reference
Connector Pin 11 on the 15 pin D-Connector provides a 5 Vdc reference
output signal and is for use in generating a setpoint and/or Valve Override
Signal. The current drive capability of this output is limited to 2.5 mA
maximum and must be used with care.
3-5 Communications Features
3-5-1 RS-485 Communications (Analog versions only)
Digital communication, designed to emulate the Brooks S-series
"S-protocol" or pseudo-HART communications is available on the Brooks
SLAMf Digital Series via RS-485.
Reference X-DPT-DeviceNet-Digital-MFC-eng, Part Number 541B066AHG
for more detail regarding the capabilities of this communication interface.
3-5-2 DeviceNet Communications Features
The Brooks SLAMf Digital Series is also available with DeviceNet TM
communication capability. DeviceNet is an open digital protocol capable of
high speeds and easy system connectivity. Brooks Instrument has several
of its devices available on this popular networking standard, and is a
member of ODVA
TM (Open DeviceNet Vendors Association), the governing
standard body for DeviceNet.
DeviceNet
is similar to the RS485 standard in that it is a multi-drop
connection that allows a maximum of 64 devices to be connected on the
same network. Baud rate selections for DeviceNet
products are 125K,
250K and 500K and can be selected via MAC ID switches mounted on the
device.
The DeviceNet
communication link also provides access to many of the
Brooks SLAMf Digital Series functions for “control and monitor” operations,
including:
• Accurate setpoint adjustment and flow output measurement (including
units of measure selection)
• PID Settings (controller only)
• Valve Override (controller only)
• Calibration Gas Select
• Soft Start Control (controller only)