1-8
Brooks
®
Digital MFC's & MFM's
Section 1 Introduction
Installation and Operation Manual
X-TMF-SLA5800-Series-RevB-MFC-eng
Part Number: 541B187AAG
January, 2017
RS485 Communications
The Brooks Digital Series is equipped with RS485 communication
capability. Refer to Figure 1-4 (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 RS485 are:
1200, 2400, 4800, 9600, 19200 and 38400 baud and can be selected via
the Brooks Expert Support Tool (BEST) .
The RS485 is essentially a multidrop connection. It allows a maximum of
32 devices to be connected to a computer system. Personal computers are
not equipped with RS485 ports as standard. An RS232/USB to RS485
converter or RS485 interface board is therefore required to connect an
RS485 network to a standard personal computer. The RS485 bus, a daisy
chain network, meaning that the wires are connected at the units as in Figure 1-1.
Figure 1-4 SLA5800 Series RS485 15-Pin Analog Connector and Pinouts
Function
PIN
Setpoint:
Common Input (-)
1
Flow Signal:
0(1) -5 Vdc, 0-10 Vdc (Option), Output (+)
2
TTL Alarm:
Open collector, Output (+)
3
Flow Signal:
0(4)-20 mA, Output (+)
4
Power Supply:
+13.5 Vdc to +27 Vdc(+)
5
Not Connected
6
Setpoint:
0(4)-20 mA, Input (+)
7
Setpoint:
0(1)-5 Vdc, 0-10 Vdc, Input (+)
8
Power Supply:
Common (-)
9
Flow Signal:
Common, Output, (-)
10
Not Connected
11
Valve Override:
Input
12
Auxilliary:
RT Input, 0-5 Vdc, 0-10 Vdc, Input (+)
13
RS-485:
Common B (-)
14
RS-485:
Common A (+)
15
Note: Aux Input is used for Remote
Transducer Pressure Controllers only.
