Comtech EF Data CRS-300 - Manual (Page 221)

CRS-300 1:10 Redundancy Switch MN/CRS300.IOM
Serial-based Remote Product Management Revision 19
7–5
7.5.1.2 Target Address
While up to 9,999 devices can be uniquely addressed, connection to the CRS-300 imposes some basic limitations:
• In EIA-232 applications, the Switch address is fixed at 0000.
• In EIA-485 applications, the Switch may be set to an address of 1000, 3000, 5000 or 7000. This allows up to four Switches to be
connected on the same bus.
• The 11 modems that may be connected to the Switch may be accessed for remote monitor & control through the Switch via virtual
addresses. The details of this addressing scheme is shown in Appendix C. ADDRESSING SCHEME INFORMATION. Valid remote
commands and queries that can be sent to the modems via the Switch depend upon the modem protocol and the installed
options. Consult the appropriate modem Installation and Operation Manual for further information.
Regardless of the Switch COMMs being set up for either EIA-232 or EIA-485 mode, the internal link between the Switch
and the modems is fixed (these examples refer to the old Recommended Standard (RS) designation rather than the new
designation of the Electronic Industries Association (EIA)):
• For CDM-570/A, CDM-570L/AL, CDM-600L modems:
RS-232, 9600 baud, 8-N-1, address 0
• For SLM-5650/5650A modems:
TTL Switch, 9600 baud, 8-N-1, address N/A
• For CDM-Qx/QxL modems:
RS-485, 9600 baud, 8-N-1, correct address
(see Appendix C. ADDRESSING SCHEME INFORMATION)
The Controller sends a packet with the address of a Target - the destination of the packet. When the Target responds, the address used
is the same address, to indicate to the Controller the source of the packet. The Controller does not have its own address.
The Comtech SatMac application software (Version 3.6 or higher) can monitor and control a CRS-300 redundancy system. The address
scheme details are shown in Appendix C. ADDRESSING SCHEME INFORMATION.