Comtech EF Data XPA-200 - Manual (Page 57)

XPA200-7984-I-OPT1, X-Band SSPA Remote Control Remote Control
XPA200-7984-I-OPT1, Rev.2 5-5
5.4.5 Response Timeout
A minimum of 500 milliseconds should be provided before
declaring a ‘no reponse’ instance, at which time the command
should be re-transmitted.
5.4.6 Bus Inactivity Requirement
COMTECH recommends that a minimum of 50 milliseconds bus
inactivity be provided by the user between the receipt of a
response from an addressed SSPA and issuing the next command on
the serial bus.
5.5. ACCESS METHODS
SSPAs may be directly accessed by the RS-232C interface or
by the RS-485 interface in a buss configuration.
5.5.1 RS-485
In this control network, the SSPA is paralleled on a common
RS-485 cable, and has a unique physical address. Only one RS-485
port is required on the system's monitor and control computer.
5.5.2 RS-232C
For RS-232C control, a direct RS-232C cable connection is
made to each SSPA to be accessed. If an external Monitor and
Control Computer is used, one RS-232 port per SSPA is required.
5.6 ADDRESSES
All SSPAs are addressed in a command by the Device Address.
The Device Address consists of a physical address or a physical
address plus a virtual address.
5.6.1 Physical Address
Each SSPA in the system must have a unique physical address.
The physical address consists of a string of 1, 2 or 3 numbers
from 1 to 256. The physical address is entered into a SSPA via
the front panel.
Example: 10 Addresses SSPA whose physical
address is 10.