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Kenwood Computer Interface Instructions _________________________
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Kenwood Computer Interface Instructions
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These Instructions are TS-440 specific, but the basics also
apply to the TS-940, TS-811 and TS-711.
It is possible to save yourself a few dollars and lose nothing
in quality by buying the parts to upgrade your Kenwood radio for
computer control. Just purchase the parts were you find them and
install them using the instructions in the Radio's Manual.
IC 54 is a uPD-8251-AC Serial Communications Interface.
Commonly called an 8251A ($1.89 Mail Order)
IC 55 is a TC-4040-BP 12 Stage CMOS Divider.
Commonly called a 4040 ($0.69 Mail Order)
The IC-10 Interface Kit from Kenwood Contains ONLY these two parts
and less instructions than are in this file. The only thing you are
going to miss, is the $22+ price tag on the IC-10 Kit.
Signals are TTL levels (NOT RS-232)
Baud rate is 4800 (1200 Opt.)
Format is ASCII Serial; 1 Start, 8 Data, 2 Stops
The Baud rate may be changed to 1200 Baud by removing jumper W50
and installing a jumper from the left pad to the center pad as viewed
from the front of the radio. This will become obvious once you have
the radio opened up. Many other Baud rates are possible, just look
at the schematic.
As long as you are in the radio, lift D-60 to enable the
10 Hz. display. The main tuning knob is varing this digit, so
you might as well see it. It also helps when using RIT/XIT as
the RIT/XIT display does not resolve the 0.01 KHz. digit. This
Modification is in the Radio's Book.
Not in the book is the fact that if you lift D-80 and do
an MPU reset, you will be able to transmit on any frequency
between 1.5 and 30.0 MHz. This means you will be able to
work the Mars nets, Etc. Do not transmit out of band. It is
illegal even if it is accidental.
Some computers use TTL levels on their serial ports. If so,
here is a time when you will not have to convert it to RS-232.
The IF-232 Interface from Kenwood is a 1488 and a 1489 chip
in a box. These are an RS-232 Quad Line Driver and Receiver
and are available at Radio Shack for $1.29 Each. Here is an
easy project that will save you a lot over the $69+ Kenwood price
of the IF-232 Interface. The 1488 needs a + and - supply.
Unregulated + and - 12vdc is just fine. Get the +5 vdc for the
1489 by putting a 7805 regulator on the +12 vdc supply. 100 ma.
is about the max you'll draw, so the smallest transformer you
can find will still be plenty large. Don't forget to series up
two of each gate to cancel the inversion that the 1480's produce.
ACC-1 Connector Use a 6 Pin DIN Connector.
(Radio Shack $1.29)
Pin Signal Comments
________________________
1 Gnd Signal Ground
2 TXD Serial Data from Radio to Computer
3 RXD Serial Data from Computer to Radio
4 CTS Computer Ready; (Radio Input)
5 RTS Radio Ready; (Radio Output)
6 No Connection
Pins 4 and 5 may be left Unconnected.
***** Command Description for Kenwood Computer Interface *****
______________________________________________________________
Auto Information
________________
AIn;
The Radio Will Send the Status Info Automatically
Whenever the Operator Manually Varies any Function
on the Radio which is Covered in the IF; Command
Where n = 0 for Auto Info OFF
1 for Auto Info On
The Status Information Will be Sent in the Form :
As defined in the IF; Command
Display Memory
______________
DMnnnn;
This is a Factory Diagnostic Function
and is of no practical use to the operator
The Contents of the MPU Memory will be Read
Where nnnn = MPU Address (0000 Thru FFFF (HEX))
The Contents of the MPU Memory Will be Sent in the Form :
DMnnnn-aabbccddeeffgghhiijjkk;
Where nnnn = MPU Address (0000 Thru FFFF (HEX))
aa~~kk = Hex Number Pairs Of Next 16 Locations
Down
____
DN;
The Frequency or Memory Channel
Will Decrement One Step
Frequency VFO A / VFO B Request
_______________________________
FA;
FB;
The Frequency in the Selected VFO Will be Read
The Frequency Will be Sent in the Form:
FAggmmmkkkhhh; or
FBggmmmkkkhhh;
Where gg = GHz. Value
mmm = MHz. Value
kkk = kHz. Value
hhh = Hz. Value
Frequency VFO A / VFO B Select
______________________________
FAggmmmkkkhhh;
FBggmmmkkkhhh;
The VFO Selected Will be Set to the Frequency Defined
Where gg = GHz. Value (May be sent As 00 or Spaces)
mmm = MHz. Value
kkk = kHz. Value
hhh = Hz. Value
Function Select
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FNn;
The Function Defined Will be Selected
Where n = 0 for VFO A
1 for VFO B
2 for MEMORY
Identify Model Request
______________________
ID;
The Model of the Radio Will be sent in the Form :
ID00n;
Where : n = 1 for a TS-940 (*)
n = 2 for a TS-811 (*)
n = 3 for a TS-711 (*)
n = 4 for a TS-440
Read Information Request
________________________
IF;
The Status Information Will be Sent in the Form :
IFggmmmkkkhhh snnnzrx yytdfcp
Where gg~~hhh = Value as defined in FA Command
s = "+" or "-" Value of RIT/XIT
nnn = Value of RIT/XIT (n.nn kHz.)
z = "0" (Not Used in TS-440)
r = Value as defined in RT Command
x = Value as defined in XT Command
yy = Memory Channel No.
t = 0 for Receive
1 for Transmit
d = Value as defined in MD Command
f = Value as defined in FN Command
c = Value as defined in SC Command
p = Value as defined in SP Command
Lock Knob
_________
LKn;
The Manual Frequency Control Functions Will be Disabled
Where n = 0 for Lock OFF
1 for Lock ON
Memory Channel Select
_____________________
MCxmm;
The Memory Channel Defined Will be Selected
Where: x = Don't Care (Use "0" or Space)
mm = Memory Channel No. (00 thru 99)
Mode Select
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MDn;
The Mode Defined Will Be Selected
Where: n = 1 for LSB
2 for USB
3 for CW
4 for FM
5 for AM
6 for FSK
Memory Read
____________
MRnxrr;
The Memory Channel Defined Will be Read
Where: n = 0 for RX VFO
1 FOR TX VFO (Split Channels Only)
x = Don't Care (Use "0" or Space)
rr = Memory Channel No. (00 thru 99)
The Memory Information will be sent in the Form :
MRn rrggmmmkkkhhhdz ;
Where: n = 0 for RX VFO
1 FOR TX VFO (Split Channels Only)
rr = Memory Channel No. (00 thru 99)
gg~~hhh = Value as defined in FA Command
d = Value as defined in MD Command
z = "0" (Not Used in TS-440)
(Note: Four trailing Spaces)
Memory Write
____________
MWnxrrggmmmkkkhhhdzxxxx;
The Memory Selected Will be Set to the Frequency Defined
Where: n = 0 for RX VFO
1 for TX VFO (Split Channels Only)
x = Don't Care (Use "0" or Space)
rr = Memory Channel No. (00 thru 99)
gg~~hhh = Value as defined in FA Command
d = Value as defined in MD Command
z = "0" (Not Used in TS-440)
RIT/XIT Clear
_____________
RC;
The RIT/XIT will be set to 0.00 kHz.
RIT/XIT Down
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RD;
The RIT/XIT will Decrement by 0.01 KHz. (10 Hz.)
RIT/XIT UP
__________
RU;
The RIT/XIT will Increment by 0.01 KHz. (10 Hz.)
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