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Section 1 Introduction
®
Brooks
Digital MFC's & MFM's
1-8
Table 1-2 Calibration Select Signal.
DEFAULT = CAL# 1 (External resistor not installed)
CAL
Resistor Value (k ohms)
1
Not Installed
2
Shorted
3
665
4
324
5
191
Table 1-3 Analog I/O Pin Connections:
Function
Setpoint, Common Input (-)
Flow Signal, 0(1) -5 volt, Output (+)
TTL Alarm, open collector, Output (+)
Flow Signal, 0(4)-20 mA, Output (+)
Power Supply, +13.5 Vdc to +27 Vdc(+)
Not Connected
Setpoint, 0(4)-20 mA, Input (+)
Setpoint, 0(1)-5 Vdc, Input (+)
Power Supply, Common (-)
Flow Signal, Common, Output, (-)
Reference, +5 Vdc, Output (+)
Valve Override, Input
Calibration Select Input
RS-485 Common B (-)
RS-485 Common A (+)
RS-485 Communications
The Brooks Digital Series is equipped with RS-485 communication
capability. Refer to Table 1-3 (Analog I/O pin connections), that enables the
device to communicate via a personal computer for process control.
Baud rate selections for the Brooks Digital Series related to RS-485 are:
1200, 2400, 4800, 9600, 19200 and 38400 baud and can be selected via
the Brooks service Suite
The RS-485 is essentially a multidrop connection. It allows a maximum of
32 devices to be connected to a computer system. IBM-compatible PC's
are not equipped with RS-485 ports as standard. An RS-232 to RS-485
converter or RS-485 interface board is therefore required to connect an
RS-485 network to a standard pc. The RS-485 bus, a daisy chain network,
meaning that the wires are connected at the units as in Figure 1-2.
Installation and Operation Manual
X-TMF-SLA5800-MFC-eng
Part Number: 541B027AAG
CAL
Resistor Value (k ohms)
6
7
8
9
10
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
TM
.
April, 2013
124
80.6
52.3
30.9
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