SRK Electronics MFTX100, Руководство по эксплуатации и обслуживанию, Страница: 50 / 100

MFTX AM TRANSMITTERS
SRK Electronics 50
10.2 Serial remote control
The transmitter may be monitored and controlled remotely via the “TELEMETRY”
connector on the rear of the unit. This is an RS232 standard connection with the
following characteristics:
Baud rate:
9600
Data bits: 8
Parity: NONE
Stop bits: 1
Flow control: NONE
The pinout for the DB9 connector is as follows: pin 2, transmit data, pin 3, receive
data, pin 5, common (0V). All other pins are not connected.
The transmitter responds to the following commands. <CR> indicates the ASCII
character 0D hex. All letters are upper case, spaces (20 hex) are indicated by
“_”. All commands must be terminated by <CR>. Note that a line feed (0A hex)
must not be sent before or after <CR>. After a response is sent, a carriage
return, line feed and “>” are sent back by the transmitter. For M2M functionality,
this can be used to ensure a command is not sent before a previous command
has
Whilst this interface is designed specifically for human interaction, machine-to-
machine control can be implemented by using the syntax for each command as
described in the relevant section. The only additional consideration is time
between transmissions of characters to the transmitter. All characters received
by the transmitter over the serial remote control are read immediately and the
relatively slow baud rate of this link means that characters can be sent to the
transmitter with no wait period inserted between them. The only exception to this
is the <CR> (0Dh) byte which indicates to the transmitter the end of a command.
Upon receipt of a <CR> character the transmitter disables the serial link receiver
whilst the command is processed, a response generated and sent, then
<CR>,<LF> and > sent by the transmitter. Any automated communication should
wait for the receipt of the “>” character before starting to send a new command to
avoid losing command characters.
10.2.1 Serial command list (alphabetical)
Below is a list of all serial commands in alphabetical order. For more information
regarding any particular command please consult the relevant section that
follows.
Command Description