INFICON STC-2000A Thin Film Deposition Controller Operating Manual - Manual (Page 198)

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STC-2000A DEPOSITION CONTROLLER
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SECTION 6.0
Computer Interfacing
The STC-2000A can be connected to a computer in a variety of ways. An RS-232 interface is
standard and an industrial bus interface such as DeviceNet, PROFIBUS-x
or CANopen can be factory added as an option. There is room for only one optional card
. There is also
another hardware option for an external I 2 C connection .
For the RS-232 interface, either a Sycon protocol or a simple ASCII protocol can be selected. This section
will describe the hardware with each interface, and give an example of how to interface to a PC host.
RS-232 Interface Description
RS-232 is an electrical specification for the transmission of data in a serial format. What this
means is that the mechanism for transmitting data is defined by RS-232. The particular set of commands is
defined by each vendor as they see fit. There is no computer program that will "communicate with all
RS-232 devices". Different sets of commands and miscellaneous overhead must be handled differently.
The Sycon protocol incorporates message length and checksum characters which insure the integrity of the
data transmission.
Baud Rates And Cabling
No matter what protocol you are using, the first order of business is to get the STC-2000A
connected to the host computer and set up the baud rates. Figure 6.1 shows how to connect to an IBM-PC
and IBM-AT. Note that the connectors are different for each end, label similar ends accordingly.
Making An RS-232 Cable
IBM - PC,XT
TxD
RxD
CTS
2
3
5
DSR
GND
DTR
6
7
20
to: STC-2000A
9 PIN FEMALE
RxD
TxD
GND
SHIELD
to: STC-2000A
9 PIN FEMALE
2
3
9
5
RxD
TxD
GND
2
3
9
5
SHIELD
IBM-AT
9 PIN FEMALE
RxD
TxD
CTS
DTR
GND
DSR 6
2
3
8
4
5
Figure- 6.1: Example Cable: Connections From STC-2000A To MS-DOS Computer.
SECTION 6.XX page 198 of 292