Lake Shore Model 340 Temperature Controller User’s Manual
Measurement Operation
5-7
5.4.2 Input Setup with a Scan Mode Active
When any of the scan modes are selected, the input setup screen for the A input will change slightly. The
input field will allow setting of channel A1 thru A16 and a temperature response curve can be entered for each
channel. Changing parameters other than enable and curve will act globally for all channels.
To select a scan channel for setup, press the
Input Setup
key. Use the
s
or
t
key to select input
A
. Press
the
Enter
key. The scan channel number will be highlighted. Use the
s
or
t
key to select the desired scan
channel number (1 thru 16). Press the
Enter
key. The
Enable
field is now highlighted. Use the
s
or
t
key to
select
ON
. Press the
Enter
key. The
Curve
field is now highlighted. Use the
s
or
t
key to select the desired
sensor to temperature curve (only curves appropriate to the sensor type display). Press the
Save Screen
key.
The default settings are Channel 1 and Enable On.
Once the channels are setup and enabled, use Display Format to actually display the results of the scan
channels on the front panel. Refer to Paragraph 4.5.
5.4.3 Manual
Scanning
Once the individual input channels have a designated curve, the user can manually select the channel to be
scanned. The Model 340 can set its digital outputs to the corresponding scan channel. If the external scanner
has digital control inputs the Model 340 can be used to select a channel. This is a convenient way to
synchronize the scanned readings or automate the scan operation using only the interface of the Model 340.
To manually select a scan channel for reading,
press the
Scan Setup
key. The
Mode
field will be
highlighted. Use the
s
or
t
key to select
MANUAL
. Press the
Enter
key. The Channel
selector will appear. Use the
s
or
t
key to select
the appropriate channel and press the
Save
Screen
key to store the change in the Model 340.
The default setting is A1.
The digital outputs must be set to scan mode to
report the scan channel. Refer to Paragraph 7.2 for
digital output mode setting. When the digital
outputs are set to work with the scanner and
manual scan mode selected, digital output signals
D1 to D4 report the active scan channel as shown
below. Digital output logic levels are described in
Paragraph 7.2.
C h a n n e l:
M o d e :
A 1
M A N U A L
E X T E R N A L S C A N N E R S E T U P
Channel DO4 DO3 DO2 DO1
1 0 0 0 0
2 0 0 0 1
3 0 0 1 0
4 0 0 1 1
5 0 1 0 0
6 0 1 0 1
7 0 1 1 0
8 0 1 1 1
9 1 0 0 0
10 1 0 0 1
11 1 0 1 0
12 1 1 1 1
13 1 1 0 0
14 1 1 0 1
15 1 1 1 0
16 1 1 1 1