6-4 REMOTE/AUTOMATED CONTROL
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6.2 Remote Control using the DB-37 Connector
The DB-37 connector is an extended control set which gives the operator full
access to the Auto Controller inputs and outputs. There are two main options
when using the DB-37 connector for remote control of the Auto Controller. One
option is to enable one of the four programs stored in the auto controller. These
programs can be acquired using the front panel as described in the operation
sections 4 and 5 of this manual. The other option is to input the desired operat-
ing parameters and then use the Auto Controller for sequencing and/or auto-
matic feedback to keep the discharge parameters constant.
6.2.1 Remote Enable of the Four Stored Programs using the
DB-37 Connector
In contrast to the DB-25 control, the DB-37 I/O allows program selection
through the rear input ports. When using remote enable, the programs can
be acquired using the front panel as described in Operation sections 4 and
5 of this manual or the can be acquired remotely as described below in sec-
tion 6.2.2. If the programs were acquired using the front panel, switch the
front panel from local to remote.
Pins 16 (Program select 0) and pin 34 (Program select 1) on the rear panel
DB-37 connector are used to select the four programs. Making connections
to common pin 7 or leaving the connections open as indicated below in
table 6-2 selects the programs. Once the program is selected, connecting
remote enable pin 36 to common pin 7 or 8 on rear panel DB-37 connec-
tor enables it. Removing the connection between pin 36 and pin 7 or 8
returns the Auto Controller to Standby. Switching to another program while
the Auto Controller is enabled will instantly commit to running the program
that has been selected.
Table 6-2. Remote program selection using pins 16 and 34 on the DB-37.
Program Number
Pin 34
Pin 16
1
Open
Open
2
Open
Common
3
Common
Open
4
Common
Common
6.2.2 Remote Gas Channel Setpoint Description for the DB-37 Connector
The gas channel setpoints all use 0-5 volt inputs (referenced to pin 13) that
correspond with 0 to the maximum output for the MFC in sccm. A setpoint
