KPC-3+
Telemetry Input
and
Control Output
Standardization Document
for
Oregon Coast Repeater Group
APRS Digi-peaters
and
Network Nodes
Version 20041226.1
December 26, 2004
Paul Messer, WA7ZVY
KPC-3+ Telemetry Input and Control Output Standardization Document
for Oregon Coast Repeater Group APRS Digi-peaters and Network Nodes
Change Log
Date of change:
April 1, 2004
April 15, 2004
December 9, 2004
December 12, 2004
December 26, 2004
December 26, 2004
Subject of change:
Initial file creation
Major additions and changes to entire doc
External Telemetry Adapter added
Control Output text added
External Control Adapter pictures added
Page 2 of 16
KPC-3+ Telemetry Input and Control Output Standardization Document
for Oregon Coast Repeater Group APRS Digi-peaters and Network Nodes
Table of Contents
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
Telemetry Inputs on KPC-3+ ...................................................................... 4
Telemetry Range Control ............................................................................. 4
Pre-wired Analog Telemetry Inputs .......................................................... 4
Patch Wired Telemetry Inputs .................................................................... 5
Digital Only Telemetry Inputs .................................................................... 5
Telemetry UI Frame ...................................................................................... 5
Telemetry Input Wiring Configuration Table ......................................... 6
Control Outputs on KPC-3+ ........................................................................ 7
Telemetry Input and Control Output Schematic Diagram ................... 8
System Level Diagram .............................................................................. 9
Telemetry Breakout Adapter ................................................................. 10
DB-25 Terminal Connector Pin-out .................................................... 12
Control Breakout Adapter ...................................................................... 13
PCB Layout for Attenuator Board ....................................................... 14
December 26, 2004
Page 3 of 16
KPC-3+ Telemetry Input and Control Output Standardization Document
for Oregon Coast Repeater Group APRS Digi-peaters and Network Nodes
1. Telemetry Inputs on KPC-3+
There are five analog telemetry inputs possible on the KPC-3+. However, of these five
inputs, only two of them are connected to the external input connector pins in an
off-the-shelf stock KPC-3+. The other three inputs must be internally patch wired to an
external connector to make them available for external usage.
The analog telemetry inputs, to the KPC-3+’s CPU, are limited to an input voltage range
of 0.0 volts to 5.0 volts. Therefore, to monitor devices or functions that have a higher
voltage range, an attenuating resistive divider must be used. The two pre-wired telemetry
inputs have a non-populated resistor location available for each of them, to create the
attenuators for those channels.
Also, a single digital only telemetry input is available by using the Data Terminal Ready
input signal. This DTR signal is wired, but not used by the KPC-3+’s software. It is,
however, reported to the user in the telemetry data UI frame packet.
2. Telemetry Range Control
The later versions of the KPC-3+ software (version 9.0) include a “RANGE” command.
This command allows the user to specify how the analog telemetry data will be reported
back to the user. The user must still insure that the input signal level stays within the 0.0
volt to 5.0 volt input range. But, by using the “RANGE” command, the user, for example,
can specify that a signal going from 0.0 volts to 5.0 volts will report back to the user as 0
to 150. So, for example, if one wanted to measure a 120VDC power supply going from 0
to 150VDC, this would require that an input attenuator with a 30:1 attenuation factor be
used. Since it is important to keep the actual voltage levels going into the KPC-3+ at a
“safety extra low voltage level” (less than 48 volts, and a lower level is even better),
using an external attenuator setup is required. One possible solution would be an external
100k-ohm ½ watt input resistor with an external 3450-ohm pull-down resistor. (However,
the input leakage current needs to be factored into any high value resistor usage, as it
could significantly affect the accuracy of the sampled signal). No internal pull-down
resistor would be used inside the KPC-3+ with this example external attenuator
arrangement.
3. Pre-wired Analog Telemetry Inputs
The two pre-wired telemetry inputs could be input on either the DB-9 radio port or the
DB-25 terminal port. For consistency, and to keep these input signals independent of the
control output signals (see Section 9 on page 8), it is recommended that the inputs be
setup to use the DB-25 terminal connector input. This way, both the pre-wired inputs and
the patch wired inputs would all be on the same DB-25 terminal port connector. The
information in the configuration table shows the positions to move jumpers to achieve
this setup.
December 26, 2004
Page 4 of 16
KPC-3+ Telemetry Input and Control Output Standardization Document
for Oregon Coast Repeater Group APRS Digi-peaters and Network Nodes
Two resistor positions are available at R13 & R27 to act, along with the two 10k ohm
input resistors R18 & R24, as an attenuator to allow higher voltage levels to be input into
the telemetry inputs. If these resistors locations (R13 & R27) are populated with 2.4k
ohm resistors, this will cause the scale for each input to be set such that the telemetry
channel will read in 0.1V steps to produce a reading of 050 for a 5V input signal and 120
for a 12V input signal, for example. (The resistive divider is made up of a 10k ohm input
resistor with the 2.4k-ohm resistor going to ground). This type of an arrangement might
be useful for KPC-3+ units with older software that do not support the “RANGE”
command.
4. Patch Wired Telemetry Inputs
To use the other three telemetry channels, a small circuit board is constructed with
positions for attenuator resistors, zener protection diodes, and small filter capacitors. This
small circuit board is sized such that it will fit into the hole that the optional 9V battery
utilizes. This small circuit board is wired to the P2 connector (to allow external access)
and to the CPU integrated circuit for the actual A/D input signals.
5. Digital Only Telemetry Inputs
There is one binary only telemetry input available. This input is the DTR signal input on
the DB-25 terminal connector, P2-20. The KPC-3+ manual states, "Although
interconnected via a buffer IC to the processor, this line is currently ignored." The high
or low state of the DTR input signal is reported in bit 7 of the telemetry binary values
( b7 b6 b5 b4 b3 b2 b1 b0 ). Note: The buffer in this pin's path is an inverter, so the reported
signal will be inverted from the actual input level.
The five analog telemetry inputs may also be used for binary data inputs. Their state is
also reported in the telemetry binary values ( b7 b6 b5 b4 b3 b2 b1 b0 ). The reported signal
levels for these five signals are NOT inverted. Note: It may be necessary to remove the
pull-down scaling resistor, on the input, to achieve satisfactory signal levels for proper
detection of logic 1 levels from typical TTL, LVTTL, or LVCMOS devices.
6. Telemetry UI Frame
A telemetry UI frame reports as:
T#nnn,an0,an1,an2,an3,an5,b7b6b5b4b3b2b1b0
Where:
• nnn is a decimal sequence number that cycles from 000 to 999 and increments
upon each transmission of the telemetry frame. At count 999 it returns to 000
on the next increment.
• an0,an1 are the analog telemetry values from the pre-wired telemetry
channels.
December 26, 2004
Page 5 of 16
KPC-3+ Telemetry Input and Control Output Standardization Document
for Oregon Coast Repeater Group APRS Digi-peaters and Network Nodes
•
•
an2,an3,an5 are the analog telemetry values for the patch wired telemetry
channels.
b7 b6 b5 b4 b3 b2 b1 b0 are the binary reported values for the telemetry port. The
most significant bit, b7, corresponds to the DTR signal level. b5, b3, b2, b1, b0
correspond to the binary logic high or low levels of an5, an3, an2, an1, an0.
7. Telemetry Input Wiring Configuration Table
The following table shows information related to the connections necessary to configure
the AD0 and AD1 pre-wired telemetry channels and to add the A/D Attenuator Board to
the KPC-3+ for telemetry input:
Channel
AD0
AD1
Wire DB-25F Terminal
Connector Pin or Internal
Connection Point
Add Wire to CPU Pin
(note a wire pad is
available close to the
CPU pin)
Voltage or
Function
Monitored
or Controlled
Already wired on KPC-3+ PCB. Place
jumper on J8 center to pin 2. Connects
input to P2-18. Add a 6.0v zener diode
at R27 position, anode to ground,
cathode to signal line. Add a 2.4K ohm
resistor in parallel with the added zener
diode.
Already wired on KPC-3+ PCB.
Users choice.
Already wired on KPC-3+ PCB. Place
jumper on J10 center to pin 2. Connects
input to P2-11. Add a 6.0v zener diode
at R13 position, anode to ground,
cathode to signal line. Add a 2.4K ohm
resistor in parallel with the added zener
diode.
Already wired on KPC-3+ PCB.
Users choice.
AD2
Attenuator Board Pad W2 to
U5-63 wire pad.
Users choice.
Attenuator Board Pad W1 to P2-12.
AD3
Attenuator Board Pad W4 to
U5-65 wire pad.
Users choice.
Attenuator Board Pad W3 to P2-14.
AD5
Attenuator Board Pad W5 to P3-1
(internal) or P2-19 (external).
Attenuator Board Pad W6 to
U5-62 wire pad.
+12V (internal) or
users choice (external).
Ground
Connect Attenuator Board Pad WG to GND pad near R33.
December 26, 2004
Page 6 of 16
KPC-3+ Telemetry Input and Control Output Standardization Document
for Oregon Coast Repeater Group APRS Digi-peaters and Network Nodes
8. Control Outputs on KPC-3+
Two open-drain control outputs are available on the KPC-3+’s radio port, P1. The two
control pins are capable of sinking a maximum of 200mA continuously, and 500mA
pulsed. The voltage level applied to the control pins must be less than +60VDC and it is
highly recommended to limit any voltage level to +48VDC or less. Negative voltage
levels are not permitted. The two control pins are controlled with the KPC-3+’s “CTRL”
command.
Command syntax is:
CTRL < A | B > [ n | ON | OFF | LONG ]
Where:
< A | B > selects which control output the command will affect, either CTLA or
CLTB. If not specified, both the CTLA and CTLB outputs are affected.
[ n | ON | OFF | LONG ] specifies how to affect the selected control output(s).
n
specifies the number of 100 milliseconds pulses to do to the port(s).
The valid range is from 1 to 20.
ON
specifies to turn on the control output transistor, which will drive the
open-drain output to GROUND.
OFF
specifies to turn off the control output transistor, which will allow the
open-drain output to float, or go to any attached pull-up resistor’s
positive rail voltage.
LONG specifies to turn on the control output transistor for one pulse lasting
1.5 seconds duration. Note: only one LONG pulse can be generated at
a time with the CTRL command.
December 26, 2004
Page 7 of 16
KPC-3+ Telemetry Input and Control Output Standardization Document
for Oregon Coast Repeater Group APRS Digi-peaters and Network Nodes
9. Telemetry Input and Control Output Schematic Diagram
KPC-3+
P2- DB25F
Serial Port
Connector
Circuitry inside this box (except D a, D b, R13 & R27) is
already present on the KPC-3+ circuit board.
MC68HC11F1
J8
B
P1 - DB9F
Radio Port
Connector
U5
R24
10K
1
A
59 (AN0)
2
P2 - 18
(AD0)
R27
2.4K
Install R27
for input scaling.
Da
6.0V
C1
.001uF
(CTLA) 37
J10
A
P2 - 11
(AD1)
G
S
Add Zener
Protection Diodes
R18
10K
1
B
61 (AN1)
2
Install R13
for input scaling.
P1 - 8
(CTLA)
D
C42
.001uF
R13
2.4K
Db
6.0V
P1 - 4
(CTLB)
D
C35
.001uF
C3
.001uF
(CTLB) 36
G
S
A / D Attenuator Board
W1
P2 - 12
(AD2)
R1
10K
W2
63 (AN2)
R2
2.4K
W3
P2 - 14
(AD3)
R3
10K
W5
Internal +12V
(P3-1)
December 26, 2004
C1
.001uF
W4
65 (AN3)
R4
2.4K
P2 - 19
(AD5)
D1
6.0V
D2
6.0V
R5
10K
C2
.001uF
W6
62 (AN5)
R6
2.4K
D3
6.0V
C3
.001uF
20041212.1 PM
Page 8 of 16
KPC-3+ Telemetry Input and Control Output Standardization Document
for Oregon Coast Repeater Group APRS Digi-peaters and Network Nodes
10.
System Level Diagram
The system level diagram shows one possible telemetry implementation. This
configuration allows the monitoring of power system sources along with the internal
power delivery in the KPC-3+. Five inputs and two outputs are available for general
monitor and control functions. Note that the two digital control outputs, CTLA and
CTLB, are located on the radio port connector, P1.
KPC-3+
Automatic
120 VAC
Mains
Transfer Switch
Gen
120 VAC
Power Supply
13.8 VDC
Output
12 VDC Power Input
AD5
Scale: 0-25.5 VDC
Range: 0-255
Engine
13.8 VDC
Battery
Float Charged
Auto-start
Generator
FAT PLUG
120 VAC In
6.0 VDC Out
cap filtered
FAT PLUG
120 VAC In
6.0 VDC Out
cap filtered
5VDC
Regulator
AD3
Scale: 0-25.5 VDC
Range: 0-138
AD2
Scale: 0-25.5 VDC
Range: 0-138
AD1
Scale: 0-25.5 VDC
Range:
CTLA
Open Drain Output
AD0
Scale: 0-25.5 VDC
Range:
DOOR
INTRUSION
SWITCH
December 26, 2004
CTLB
Open Drain Output
DTR (inverting digital only input)
Typical: 0-5 VDC
Pulled high by a 10K to +5V. To use, pull to GND with
an open collector gate, transistor, or switch.
Page 9 of 16
KPC-3+ Telemetry Input and Control Output Standardization Document
for Oregon Coast Repeater Group APRS Digi-peaters and Network Nodes
11.
Telemetry Breakout Adapter
An external breakout adapter, for the telemetry signals, is constructed with a DB25 male
plug, a DB25 female socket and a set of side entry vertical screw terminal strips. This
allows easy access to the KPC-3+’s telemetry input signals. The adapter unit is built into
a DB25 “in-to-out” adapter housing. The male connector of the adapter is plugged into
the KPC-3+’s female DB25 serial port connector (P2); and, any serial device normally
used with the KPC-3+ is then plugged into the female DB25 socket on the Telemetry
Adapter.
KPC-3+ EXTERNAL
TELEMETRY ADAPTER
DB25-F
DB25-M
1
Chassis GND
1
2
TxD
2
3
RxD
3
4
RTS
4
5
CTS
5
6
DSR
6
7
Signal GND
7
8
DCD
9
N.C.
10
8
N.C.
9
N.C.
N.C.
10
11
N.C.
(AD1 / CTLA)
11
12
N.C.
(AD2)
12
(optional tnc pwr)
13
13
14
N.C.
(AD3)
15
N.C.
N.C.
15
16
N.C.
N.C.
16
17
N.C.
N.C.
17
18
N.C.
(AD0 / CTLB)
18
N.C.
(AD5)
19
20
N.C.
DTR
20
21
N.C.
N.C.
21
N.C.
22
N.C.
23
N.C.
24
N.C.
25
19
22
N.C.
23
N.C.
24
N.C.
25
N.C.
AD0
AD1
AD2
AD3
DTR
AD5
GND
GND
14
WA7ZVY 20041205.1
December 26, 2004
Page 10 of 16
KPC-3+ Telemetry Input and Control Output Standardization Document
for Oregon Coast Repeater Group APRS Digi-peaters and Network Nodes
Telemetry Breakout Adapter
Telemetry Breakout Adapter
Telemetry Breakout Adapter
December 26, 2004
Page 11 of 16
KPC-3+ Telemetry Input and Control Output Standardization Document
for Oregon Coast Repeater Group APRS Digi-peaters and Network Nodes
12.
DB-25 Terminal Connector Pin-out
EIA-232 Industry Standard Pinout
with
KPC-3+ Signal Names (Green),
KPC-3+ Not-used Signals (Blue)
and
Telemetry Input Signal Overlay (Red)
(for reference)
Signal Name/Direction
Inside KPC-3+
<== is from outside world
to KPC's hardware.
Logic Ground ===
Signal Direction
At External Connector.
Arrow in is from outside world.
Arrow out is going to outside world.
Signal Name/Direction
Inside KPC-3+
==> is from outside world
to KPC's hardware.
==> AD3 (A/D Attenuator)
TXD <==
( === Not Used )
RXD ==>
( === Not Used )
RTS <==
CTS ==>
DSR ==>
Logic Ground ===
DCD ==>
( Not Used === )
( Not Used === )
AD1<==
( === Not Used )
==> AD0
==> AD5 (A/D Attenuator)
==> DTR
( === Not Used )
( === Not Used )
( === Not Used )
AD2 (A/D Attenuator) <==
( === Not Used )
Jumper Selectable ===
( === Not Used )
20040401.2 PM
December 26, 2004
Page 12 of 16
KPC-3+ Telemetry Input and Control Output Standardization Document
for Oregon Coast Repeater Group APRS Digi-peaters and Network Nodes
13.
Control Breakout Adapter
An external breakout adapter, for the control signals, is constructed with a DB9 male
plug, a DB9 female socket and a set of side entry vertical screw terminal strips. This
allows easy access to the KPC-3+’s control output signals. The adapter unit is built into a
DB9 “in-to-out” adapter housing. The male connector of the adapter is plugged into the
KPC-3+’s female DB9 radio port connector (P1); and, any radio device normally used
with the KPC-3+ is then plugged into the female DB9 socket on the Control Adapter.
KPC-3+ EXTERNAL
CONTROL ADAPTER
DB9-F
DB9-M
1
TX Audio
1
2
XCD
2
3
PTT
4
3
CTLB
N.C.
4
5
RX Audio
5
6
GND
6
7
Optional Power or RESET
8
9
7
CTLA
N.C.
Optional Ground or RESET
8
9
CTLA
GND
CTLB
GND
WA7ZVY 20041212.1
Control Breakout Adapter
December 26, 2004
Control Breakout Adapter
Page 13 of 16
KPC-3+ Telemetry Input and Control Output Standardization Document
for Oregon Coast Repeater Group APRS Digi-peaters and Network Nodes
14.
PCB Layout for Attenuator Board
1:1 Bottom View
1:1 Mirrored Bottom View
1.00"
1.75"
1:1 Top View
W6
C3
D3
R6
R5
C2
D2
R4
R3
C1
D1
R2
R1
© 2004 PM
W5
W4
W3
W2
W1
WG
1:1 Mirrored Top View
A/D Attenuator
1:1 Composite View
W6
W5
C3
D3
R6
D2
R5
C2
December 26, 2004
R4
D1
R3
C1
R2
R1
© 2004 PM
W4
W3
W2
W1
WG
A/D Attenuator
Page 14 of 16
KPC-3+ Telemetry Input and Control Output Standardization Document
for Oregon Coast Repeater Group APRS Digi-peaters and Network Nodes
2:1 Bottom View
1.00"
1.75"
2:1 Top View
W6
W5
W4
W3
W2
W1
C3
D3
R6
R5
C2
D2
R4
R3
C1
D1
R2
R1
WG
A/D Attenuator
© 2004 PM
2:1 Composite View
W6
W5
W4
C3
D3
R6
R5
C2
D2
© 2004 PM
R4
R3
C1
D1
R2
December 26, 2004
W3
W2
W1
R1
WG
A/D Attenuator
Page 15 of 16
KPC-3+ Telemetry Input and Control Output Standardization Document
for Oregon Coast Repeater Group APRS Digi-peaters and Network Nodes
2:1 Mirrored Bottom View
2:1 Mirrored Top View
December 26, 2004
Page 16 of 16