AMPTEC 620VN
620VN
620VN-501
620VL
T
-602
620VN
OP 24/7 DC
620VN-123
D-3
RS232C Computer Control and Command Set
750 mA
620VN Rear Panel with options RS232C I/O
The rear panel
(shown above)
may contain optional
jacks, terminals, labels, and stickers.
Item 1
-The option "247" Continuous Isolated
Operating Power DC Adapter (item #1) must be left
in the rear panel jack in order to continuously operate
the unit.
For Safety Reasons
-
Only the AMPTEC
supplied AC/DC adapter, in conjunction with the
meter’s OP 247 internal DC/DC circuitry has been
tested and approved for its 3 KV isolation.
Item 2
is the fuse holder - replace with a 2 ampere 3
AG type fast blow fuse (rarely needs replacing).
RS232C Serial Interface - Item # 3 is the safety
isolated RS232C serial I/O (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 (Option 232 )
(NOTE: All front panel range buttons must be de-
selected (press in half way)
with all range
pushbuttons out
in order to disable with local
lockout and enable RS232C control.
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).
r
0
De-Selects all Ranges
r1
Selects the 20 Ohm Range
r2
Selects the 200 Ohm Range
r3
Selects the 2000 Ohm Range
r4
Selects the 20 K Ohm Range
r5
Selects the 200 K Ohm Range
r6
Selects the 2 Meg Ohm Range
V
Version
c
ommands board to output the firmware
version string.
Data Format -
The
RS232C I/O
outputs a data string
with the following format:
1.2345E+3
The measurement is always 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 Ohms
+1
+1
(where E
=10
)
Range
Exponent
20.0 Ohm
E+1
200.0 Ohm
E+2
2000 Ohm
E+3
20 KOhm
E+4
200 KOhm E+5
2.0 M Ohm E+6
An overrange condition 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 4 terminal rear terminal strip (they are
wired in parallel with the front terminals). 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 620VN Voltage
High, Voltage low, Current high and Current low wires
are permanently connected to the gold plated rear termi-
nal strip ( seel labeled 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 620VN Explosive
Safety Ohmmeter/Igniter Tester. contact AMPTEC
customer service 001-512-858-4045 .
www.amptec.com
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