Instruction manual

Chapter 4 Technical Information 33
Radio Connections
Conn
Pin
Signal
Description
1
Ground
Ground
3
TRX
TX/RX Status Input: TX=‖H‖ RX=‖L‖
9
Ground
Ground
12
DISC
Radio Discriminator
14
AFOut
Audio out from VMDE-200
16
AFIn
Audio in to VMDE-200
17
SD
Sub CPU Clock Shift
18
MicOut
TX audio out from VMDE-200
20
MicIn
Mic TX audio in to VMDE-200
22
OpTypeStb
Option board sense
24
KEY4M
Key Matrix Col 4
25
OpTyp
Option board sense
26
KEY3M
Key Matrix Col 3
28
KEY2M
Key Matrix Col 2
30
KEY1M
Key Matrix Col 1
31
SIG
Sig Mon noise squelch
32
KS4M
Key Matrix Row 4
33
SUBCPU Reset
Sub CPU Reset
34
KS3M
Key Matrix Row 3
35
RXD
Receive data from VMDE-200
36
KS2M
Key Matrix Row 2
37
TXD
Transmit data to VMDE-200
38
KS1M
Key Matrix Row 1
39
Ground
Ground
40
VDD1
3.5VDC ± 10%
Micro to Micro Communications
The microprocessor of the host radio and the microprocessor of the
VMDE-200 communicate with each other using one-byte hex
commands. This interaction allows the VMDE-200 to control many
functions of the host radio.
Software Version Verification
To verify the version of the microprocessor software, press the <#>
(pound) key followed by the <*> (asterisk) key. The embedded
software check sum will be displayed in the radio display.
Reloading Flash
If upgraded flash software becomes available, the new software can
be loaded into the VMDE-200 by performing the following:
Start the terminal emulation program ―Hyperterm‖. This program
must be set up for direct connect to Com 1 at 4800, N,8,1 with no
handshaking. After the program is set up, Go to ―File‖, select
―Properties‖ then select the tab labeled ―Settings‖. Change
emulation type to ―TTY‖. Click the ―ASCII Setup‖ button and change
the character delay to 3 mS.