INFICON MDC-360C Thin Film Deposition Controller - Manual (Page 113)

MDC-360C DEPOSITION CONTROLLER
CONTROLLER INSTALLATION 8-3
8.3.4 REMOTE POWER HANDSET
Figure 8-2 shows the location of the receptacle into which the Remote Power
Handset is plugged.
8.3.5 SOURCE-SENSOR
The system interface with the remote sensor oscillator is a 50 Ohm coax cable
terminated with BNC connectors similar to AMP 225395-1 (plug) and AMP
225396-1 (jack). The plug on the Source-Sensor Board mates to a jack on the
cable which is supplied with the oscillator.
The control voltage output is interfaced via a 4-pin, circular mini DIN connector
equivalent to CINCH MDSS-4S. The pin layout is defined in Figure 8-5 and
Table 8-2 supplies pin signal assignments.
8.3.6 RS-232 COMMUNICATION
There are two connections for the RS-232 interface port. A D9P connector is
provided on the rear panel for permanent connection to the host computer. The
pin layout is shown in Figure 8-6 and Table 8-3 lists pin signal assignments,
including a definition of whether the signal is an output from the MDC-360C or
an input to the MDC-360C.
A DJ11 jack located on the front panel is provided for temporary connection to
the host computer. Pin layout and pin signal assignments are shown in Figure
8-8 and Table 8-5.
The MDC-360C acts as DTE, and accordingly the 9-pin connector has ‘plug’
pins. It can be used with a DCE or a DTE host cable connection providing the
sense of the RxD/TxD data lines and the control lines is observed. Pin 2 ‘TxD’
transmits data from the MDC-360C to the host; pin 3 ‘RxD’ receives data from
the host. Pin 7 ‘CTS’ is a control output signal, and pin 8 ‘RTS’ is a control input
signal.
In this implementation, pin 7 ‘CTS’ means what is says, namely, this is an output
control line, and when the MDC-360C asserts this control line ‘true’ the host can
transmit to the MDC-360C. On the other hand, pin 8 ‘RTS’ is not quite what it
may seem because this is a signal input to the MDC-360C, and it is intended that
the host should assert this line ‘true’ only when the MDC-360C is allowed to
transmit data to the host. The MDC-360C does not generate an RTS ‘request-to-
send’ as such for the host PC, so the host should assert pin 8 true whenever the
MDC-360C is allowed to transmit to the host, without being asked to do so.
8.3.7 DISCRETE INPUT/OUTPUT
CAUTION: To avoid damage to the instrument, verify the input type prior to
making connections.
The MDC-360C has two types of I/O cards available. The Passive I/O card, PN#
179206, has TTL level (0 to 5 volt DC) inputs. The Passive inputs are pulled up
to 5 volts internally through a 4.7 K OHM resister and are set true, assuming the
input’s True level is set to Low, by shorting the input pins together. The Active