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21
X MICROLOGGER OVERVIEW
The 9-pin serial l/O port provides connection to
data storage peripherals, such as
the
SM192t16
Storage Module
or RC35 Cassette
Recorder, and provides serial communication
to
computer
or modem devices for data transfer or
remote programming (Section
6).
This
9
pin
port
does NOT have the same
pin configuration as
the
9
pin
serial
ports
currently used on
many
personalcomputers.
An SC32A is required to
OVl.l
ANALOG INPUTS
The
terminals
in
the upper strip are for analog
inputs.
The numbering on the terminals refers to
the diflerential channels; i.e., the voltage on
the
Hl input is measured with respect to the voltage
on
the LOW
input. When
making single-ended
measurements either
the Hl or the LOW channel
may
be used independently to measure the
voltage
with respect to the 21X
ground.
Single-
ov-2
interface the 21X to
a RS232 serial port
(Section
6).
The panel also contains two terminal strips
which
are used for sensor inputs, excitation,
control outputs,
etc.
Figure OV1-2 shows the
21X panel and the associated programming
instructions.
ended channels
are numbered sequentially,
e
the Hl and LOW sides of differential
channel2
are single-ended channels
3
and
4, respectively
(Section 13.2).
The analog input terminal
strip has an insulated
cover
to reduce temperature gradients across
the input
terminals.
The
cover is required for
accurate
thermocouple measurements (Section
13.4).
FfGURE
OVl-z.
21X
Wiring Paneland Associated Programming Instructions
SERI
L
I,/o
Tclccommunlcotlons
Progrom
Control
Instructlons
96
(Tcpe, Storog€
Module,
Printer)
97 Initiotc
Telecommunicotions
9E
Print
Chorocter
Input,/Output
Progrom
Cont
91
lf
92
lf
Comqnd
'f2J15C7E
ETCITATION
OI'TUTS
Input/Output
Instructions
4.
Ex-Dcl-Se
5.
AC
Holf
Br
6.
Full
Br
7.
5W
Holf
Br
8.
Ex-Del-Dlff
9.
Full Br-Mcx
11.Temp(107)
12
RH
(2o7)
22.
Exclt-Del
EEE
tr1
EE
EE
rilE
ANAIOG
INPIIIS
Input/Output
Instructions
1.
Volt
(SE)
2.
vott
(uFF)
4.
Ex-Del-Sc
5.
AC
Holf
Br
6.
Full
Br
7.
5W
Holf
Br
E. Ex-Del-Dlff
9.
Full
Br-Mox
11 Temp (107)
12
RH-(2O7)
15. Tcmp-TC
SE
14. Temp-TC
DIFF
17.
Tcmp-Poncl
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