Promax HD Ranger +, Руководство пользователя

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34 December 2014
A4.3
Operation Mode
The
HD
RANGER
+
accepts remote commands at any time, which the
instrument is on. That is, it is not necessary to put the instrument in special
remote control mode; rather, this mode is selected immediately when it detects a
complete command during the time necessary for its execution. The protocol
communication is as follows:
1.- HD
RANGER
+ transmits a XON code (11H) every second. The aim is to
indicate to any possible remote device that the equipment is ready to
receive data.
2.- At this moment, data streams can be sent it. Each data stream is
composed by:
a. Stream beginning: ‘*’ (code 2AH).
b. Set of characters that describe data message.
c. CR (carriage return, code 0DH).
3.- Once a data stream has been sent, will be received a XOFF (code 13H)
indicating that the transmission is stopped.
4.- Next, in case of correct message an ACK (acknowledge, code 06H) is
expected or a NAK (not acknowledge, code 15H) in the opposite case.
5.- If the sent message requires answers it will be sent at this moment.
6.- Once completed the data stream transmission, the
HD
RANGER
+
will
send a XON (code 11H) indicating that already it is prepared to receive a
new data stream.
A typical communication chronogram would be as follows:
PC (REMOTE CONTROLLER)
HD RANGER +
1) <------ XON
2) *?TV<CR> ------>
3) <------ XOFF
4) <------ ACK 5
5) <------ *TV0<CR>
6) wait…
7) <------ XON
(all characters are transmitted in ASCII code).