AMPTEC 620LM Rear Panel with RS232C I/O
Item 1
- The AMPTEC 620LM rear panel (shown above)
contains many jacks, terminals, labels, and stickers.
The special AC to DC Adapter (item #1) must be left in
the rear panel jack in order to operate the meter, as it is
fitted with option "247" (Isolated Continuous Operating
Power).
.
Item 2
is the fuse holder - replace with a 2 ampere 3 AG
type fast blow fuse (rarely needs replacing).
Item # 3 -
RS232C Serial Interface is a safety isolated
RS232C serial I/O with 9 pin D type Sub-min connector.
This RS232C Interface provides the meter’s resistance
measurements to a PLC fitted with a serial port. The
RS232C protocal settings should be 9600 Baud, 8 Bits,
No parity , 1 Stop Bit ,
9 pin D Sub-min connection
.
RS232C Command Set
Note commands are case sensitive
.
C
Continuous Read Mode -
RS232C I/O
outputs
a data string every A to D conversion cycle, approx
.
2.5
times per second.
S
Single Read Mode -
RS232C I/O
outputs a
single data string upon reception of a “R” command.
R
Read -
Commands
RS232C I/O
to output a
single data string
( 1 resistance reading).
A
Selects Auto-Range mode
r
0
De-Selects all Ranges
r1
Selects the 2.0 Ohm Range
r2
Selects the 20 Ohm Range
r3
Selects the
Diode Test
function
r4
Selects the 2K Ohm Range
r5
Selects the 20K Ohm Range
r6
Selects the 200K Ohm Range
r7
Selects the 20M Ohm Range
V
Version
c
ommands board to output the firmware
version string.
*
The isolated AC/DC Wall adapter is fitted with a
box style polarity keyed Molex connector plug # 436040-
0200. This helps prevent the accidental use of any non
approved AC/DC Wall Power Adapter from being
plugged into the AMPTEC 620LM rear panel power port
(Molex 436040-0200 mate connector)
Data Format -
The
RS232C I/O
outputs a data
string with the following format:
1.2345E+3
The measurement is usually in Ohms
+3
(where E+3 = 10 scientific notation style)
. The
Exponent is defined below.
1.2345E+3 = 1.2345
+3
+3
KOhms
(where E =10 ).
1.3700E+1
=
13.700
+1
+1
Ohms
(where E =10 )
Range
Exponent
2.0
Ohm
E+0
20.0
Ohm
E+1
Diode Test
E+0
2.0 K Ohm
E+3
20 K Ohm
E+4
200 K Ohm
E+5
20 MOhm
E+7
Overrange
is indicated by 9.9999E
nn .
Where nn is
the
selected resistance range
exponent. A Range
Error is indicated by x.xxxxERR.
Item # 4
is the unit’s serial number sticker.
Item # 5
is the gold plated 4 terminal rear terminal
strip (they are wired in parallel with the front termi-
nals). If a “2 wire ohms” connection is made then
the
V
high and
I
high terminals should be shorted
together, and the
V
low and
I
low terminals should
be shorted. The 620LM
Voltage High
,
Voltage
low
,
Current High
and
Current Low
wires are
permanently connected to the gold plated rear
terminal strip (see labeled gold plated terminal strip
on rear panel).
Item #6 Calibration Sticker -
If the calibration
due date has expired ( 1 year) AMPTEC or a Cal.
Lab can contacted to re-certify the AMPTEC
620LM Explosive Safety Ohmmeter/Igniter Tester.
contact AMPTEC customer service see website
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