Comtech EF Data CRS-400 - Manual (Page 78)

CRS-400 1:8 Redundancy Switch Revision 0
Remote Control MN/CRS400.IOM
62
Target-to-controller:
Start
of
Packet
Target
Address
Address
Delimiter
Instruction
Code
Code
Qualifier
Optional
Arguments
End of
Packet
Character < /
=, ?, !
or *
Carriage
Return
Line
Feed
ASCII
Code
60 47
61, 63,
33 or 42
3, 10
Number of
Characters
1 4 1 3 1 From 0 to n 2
Example: >0000/OPM=1{CR}{LF}
B.5.1 S
TART
O
F
P
ACKET
Controller to Target: This is the character ‘<’ (ASCII code 61)
Target to Controller: This is the character ‘>’ (ASCII code 62)
Because this is used to provide a reliable indication of the start of packet, these two
characters may not appear anywhere else within the body of the message.
B.5.2 A DDRESS
While up to 9,999 devices can be uniquely addressed via an EIA-485 bus, the 1:N
Redundancy Switch imposes some addressing specifications. The Switch address is x000:
In EIA-232 applications the switch address is fixed at 0000.
In EIA-485 applications, the switch address may be set to 1000, 2000, 3000, 4000, 5000,
6000, 7000, 8000, or 9000. Up to nine switches may be connected on the same bus.
The addresses of the modulators and/or demodulators that may be attached to the Switch
must each have its addresses set correctly, according to the Switch address and the unit’s
position in the Switch set-up:
x001 for Traffic Mod #1 x011 for Traffic Demod #1
x002 for TM #2 and on up to x012 for TD #2 and on up to
x008 for TM #8 and x018 for TD#8 and
x009 for the Redundant Mod x019 for the Redundant Demod