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GFK-0467K Chapter 4 Series 90-30/20/Micro Instructions Set 4-141
4
SVCREQ #4: Change System Comm. Window Mode and Timer Value
Use SVCREQ function #4 to change the system communications window mode and timer value.
The change will occur in the CPU sweep following the sweep in which the function is called.
Note
Of the CPUs discussed in this manual, Service Request 4 is supported only
by 90-30 CPUs, beginning with Release 8.0.
The SVCREQ function #4 will pass power flow to the right unless a mode other than 0 (Limited), 1
(Constant), or 2 (Run-to-Completion) is selected.
The parameter block has a length of one word.
To disable the system communications window, enter SVCREQ function #4 with this parameter
block:
High Byte Low Byte
0 0 address
To enable the system communications window, enter SVCREQ function #4 with this parameter
block:
High Byte Low Byte
Mode Value from 1 to 255 ms address