Brooks Instrument SLA5800 Series - Manual (Page 30)

2-8
Brooks ® Digital MFC's & MFM's
Section 2 Installation Installation and Operation Manual
X-TMF-SLA5800-MFC-eng
Part Number: 541B027AAG
April, 2013
The RS-485 is a multidrop connection and allows a maximum of 32
devices to be connected to a computer system. IBM-ompatible PCs 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 to a
standard PC. Figure 2-5 is an interconnection diagram showing two TMFs
linked to an IBM-compatible PC, via RS-485 and
RS-485 to RS-232
converter. The RS-485 bus, a daisy-chain network, meaning that the wires
are connected at the units as in Figure 2-5.
Figure 2-5 RS-485 Multidrop Interconnection TMFs and PC