1 end-of-life commands, 3 remote control protocol and structure, 1 eia-485 – Comtech EF Data LPOD-R User Manual
Page 113
LPOD-R Outdoor Amplifier / Block Up Converter (BUC)
MN-LPODR
Optional Serial-based Remote Product Management
Revision 1
5–3
5.2.1
End-of-Life Commands
Certain commands/queries are being marked by Comtech EF Data as End-of-Life (EOL). Flagged <description>
E
in the Parameter Type
column (in the Remote Commands and Queries tables in Sect. 5.4), while these commands/queries are fully supported in the LPOD-R,
Comtech EF Data strongly recommends that you use their new equivalents for new implementations.
EOL-designated Command/Query (Page #)
New Command/Query (Page #)
Remarks
CAA (5-9)
CAE (5-9)
–
CUS (5-12)
N/A
This functionality is not included in any other
remote command/query
DAT (5-12)
DAY (5-13)
–
LNA (5-15)
RNE (5-21)
–
RET (5-20)
PNM (5-18)
The replacement query provides more exact unit
hardware information
RSN (5-23)
SNO (5-23)
–
5.3
Remote Control Protocol and Structure
The electrical interface is either an EIA-485 multi-drop bus (for the control of many devices) or an EIA-232 connection (for the control of a
single device), and data is transmitted in asynchronous serial form, using ASCII characters. Control and status information is transmitted in
packets, of variable length, in accordance with the structure and protocol defined in later sections.
5.3.1
EIA-485
For applications where multiple devices are to be monitored and controlled, a full-duplex (or 4-wire) EIA-485 is preferred. Half-duplex (2-
wire) EIA-485 is possible, but is not preferred.
In full-duplex EIA-485 communication there are two separate, isolated, independent, differential-mode twisted pairs, each handling
serial data in different directions. It is assumed that there is a Controller device (a PC or dumb terminal), which transmits data, in a
broadcast mode, via one of the pairs. Many Target devices are connected to this pair, which all simultaneously receive data from the
Controller. The Controller is the only device with a line-driver connected to this pair – the Target devices only have line-receivers
connected.