User Manual

3.4 Remote Local Controller
RS-485
7521/2/2A/3/4/7 Series Hardware User’s Manual, Ver. 1.5 Sep/2002, 7Mh-001-15 -----68
7000 module
Host PC
RS-232
RS-232
tele
p
hone line
7521 series+X500
7000 module
The control program is implemented in a local 7521 series. The 7521
series will directly control the 7000 modules based on these control arguments.
The PC can access the remote 7521 series for the following items:
 Query & record the remote system status
 Download the control arguments to remote 7521 series
The remote 7521 series can communicate to the PC for the following
items:
 Emergency events call back
 Remote system status send back
Note: The 7521 series must add a X500 to control the modem.