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REGAIN LOCAL CONTROLWHEN THE COMPUTER COMMUNICATIONS ARE
DISRUPTED, ANDTHEMODEL 620A IS IN THE "RMT-RUN" MODE.
If computer communications are lost while the Model 620A is running a program in the Remote
(Ext. Computer) mode, the unit must be stopped prior to regaining Local (LCL) mode of operation.
This is accomplished by installing a momentary switch to the input terminal block TB6 of the A2216
PCB between pins 4 (Input 2, Stop) and 7 (0 V).
Pushing the button will stop the program, however, the unit will remain in the RMT mode.
Follow the sequence below to regain Local (LCL) control.
Push the RMT STOP button
Push the <PAGE DOWN> button
Push the <4> button
Push the <1> button
Push the < \/ > button (DOWN ARROW) (Moves cursor to MODE: EXT_COMPUTER)
Push <SEL> button (Twice)
Push <RESET> button
You are now in the LCL (Front Panel) mode of operation
All functions are now accessible from the front panel.
4/20 Requires 3 JUMPERS
TB1
CH 1 (+)
1
LIN INPUT
ISOLATED
2
GND
+
3
PROBE 1
-
4
-
5
PROBE 2
+
6
ISOLATED
7
GND
CH 2 (+)
8
LIN INPUT
+ OUT
ANA 1
RETURN
FR GND
+ OUT
ANA 2
RETURN
FR GND
/CTS
IN
TDX
OUT
/RTS
OUT
RXD
IN
GND
Voltages require
V range + Lin.
4/20 + 5v + LIN.
J1
1V
10V
5V
4/20mA
Jumper
FOR
LIN. Inputs
Jumper
LIN. Inputs
FOR
4/20mA
5V
10V
1V
J2
J1 & J2
See Below
TB3
1
LOOP 1
2
3
P204
4
LOOP 2
5
TB4
1
2
3
4
ANALOG
OUT 1 ZERO
5
ANALOG
6
OUT 2 ZERO
A2216 Rear Interconnect PCB
(Installed on TB6)
(To Main Menu)
(CONFIG-TUNE-CALIB)
(CONFIG-PROGRAMMER)
(To FRONT PANEL)
(To the standard run screen in LCL mode)
(Run)
(Stop)
(Reset)
(Input 4)
TB5
FUSE
1
2
3
2A 250V
P1
TB6
R11
INT SUP
1
+ COM
2
Push Button
(Momentary)
3
INPUT 1
4
INPUT 2
5
INPUT 3
6
INPUT 4
0 V
7
R12
INT SUP
8
+ COM
9
INPUT 5
10
11
INPUT 6
INPUT 7
12
13
INPUT 8
0 V
14
4/14/17
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