Appendix C
C-8
x Temperature sensor type (analog k)
--------Thermocouples---------
RTD -Sensor-
Sensor
E
J
J-1
K
K-1
R
S
T
T-1
T-2
100
100-1
590
set x to: 08
H
04
H
14
H
05
H
15
H
06
H
07
H
08
H
18
H
28
H
03
H
13
H
01
H
y Timer resolution multiplier, TRM (Setup a)
The basic 0.01second resolution of ALL instructions noted with
5
are multiplied by y
of setup n; default value is 1
H
; range is from 1
H
to FF
H
(1-255)
z response codes from Setup F identify station type.
z=: 00
01
02
03
Type=: DD (Digital)
MA (Analog)
MC
(Setup)
--
$
Firmware version number x, yy, z
S
Chassis ID (Type, No. of expanders, and firmware version)
COMMUNICATION PROTOCOL
There are two communications protocols, 2 pass and 4 pass, both of which use only ASCII
characters; units are shipped in 2 pass the most commonly used; the instructions transmitted
by the Host are identical for both protocols, they differ in their responses.
2 Pass: A correctly received instruction returns an A (and data if any) and instruction is
executed; an incorrectly received message returns a response message, and the instruction is
not executed.
4 Pass: A received instruction is echoed and not executed until Host returns an E (non E’s
cancel instruction)
CHECKSUMS:
Automatic Calculation Method
The setup eC command puts correct checksum at the end of the N02 error message;
assemble instruction for which checksum is needed in usual manner, but enter XX for ( );
the N02 response message has the correct checksum tagged on.
Manual calculation method
See appendix A of the I/O PLEXER user guide.
Defeat Checksum
Enter ?? in the ( ) position of instructions; a checksum error message will
never
be
returned; a
RISKY PRACTICE.
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