Channel selection
Channels are selected by the use of internal switches and can be set as shown below.
The bottom 4 screws will need to be removed to gain access to the switches, care must
be taken to avoid any damage which could invalidate the warranty. The channel can also
be changed by a serial command inputted from the external control system.
Figure
: Setting of channel selector switch for each channel.
By altering link options, channel change can also be implemented using TTL levels
on pins 11,12,13 & 15 of DB15 way assuming these pins are not in use and default
conditions are met. Refer to Application Notes on the Mobile Expertise Global web site.
Operation
Transmit/receive operation
The TS-D200/me-D350 can be put into transmit by different methods. When used as a
“dumb” radio, the PTT line is pulled low (pin 3 of DB15). The TX serial command will also
put the radio into transmit (pin 8 of DB15), until the RX serial command is received. If the
Mic line is low (grounded via resistor) then audio on the Mic line is transmitted and if line
is left disconnected DATA is transmitted. If one of the internal modem board is installed,
the radio can be put into transmit by receiving input serial data (pin 10 of DB15). When
the data is no longer present at pin 10, the TS-D200 will return to receive mode. See the
module manual for details.
Serial commands
The modem can be controlled by using the serial command (pin 8) data in, sending
commands to the radio such as PTT or change channel
The format for these commands (asynchronous) is:
Baud rate: 4800 bit/sec
Data: 8 bit,
Parity: Non parity
Stop Bit (SP): 1 bit
MSB
fi
rst transmission
Each serial command consists of 3 bytes. The
fi
rst byte is the command (CMD), the
second is data required by the command(DATA) and the third is the check sum (CS) to
validate contents
TX Command format:
CMD
DATA
CS
1st byte
2nd byte
3rd byte
N.B. Check Sum = 1st byte + 2nd byte. CS = CMD + DATA
●
●
●
●
●
1 2 3 4
1
16
2
3
4
5
6
7
8
9
10
11
12
15
14
13
SW401
CHANNEL NO.
SWITCH POSITION
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
6
