Satellite Upconverter Manual
WORK Microwave
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V151207
4 Remote Control Description
4.1 Overview
The converter unit can be remotely controlled through the serial interface or the Ethernet/IP-interface.
The serial interface can be configured by commands or by the front panel menu to RS232 or to
RS422/RS485. To s
upport bus structured serial communication according to RS485 ‘MULTIPOINT’ co
m-
mands are used as standard. Each device on the bus has its own address.
‘MULTIPOINT’ commands are also used for point
-to-point communication through RS232 as well as within
the packets sent and received over the Ethernet interface, when a TCP/IP connection is used.
Using the Ethernet interface the unit can also be remotely controlled through a web browser interface.
4.2 Syntax of MULTIPOINT Commands
4.2.1 What is a MULTIPOINT Command?
Multipoint commands are used widely in the satellite communications equipment industry to control equip-
ment via a RS485 bus. The ‘MULTIPOINT’ commands have to be used in systems with a bus
-structured re-
mote control configuration with more than one controlled device connected to the same controller interface or
when using the Ethernet-TCP/IP interface for remote control.
4.2.2 MULTIPOINT Command Structure
A ‘MULTIPOINT’ command consists of a string of ASCII characters with header, command, trailer and a
checksum. The ‘MULTIPOINT’ commands are described in the follo
wing section.
Important:
In all commands only capital letters are allowed!
4.2.3 General Command Structure
HEADER ’{‘
device address
command/
error code
parameter
(if necessary)
TRAILER ‘}’
checksum
HEADER:
the
character ‘{’.
Device address:
Valid addresses are between 40h (‘@’) and 5Ah (‘Z’). The address of the
device has to be configured manually in the special function menu of the con-
troller or can also be changed by remote control.
Command/error-code:
The OPCODE describes the command. If the command is correct and the
device has executed the command successfully, the OPCODE is sent back,
otherwise an error codes is sent back (see 4.2.4).
Parameter:
The number of parameters depends o
n the command. Only the characters ‘0’
to ‘9’, ‘.’, ‘+’, ‘
-
‘ and ‘?’ are allowed.
TRAILER:
the character ‘}’
Check sum X:
The check sum is calculated with the following equation:
(
)
32
95
mod
32
1
+
ú
û
ù
ê
ë
é
-
=
å
=
N
i
i
c
X
