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107
Basic PC Operation and I/O Processes
Section 4-7
4-7-4
RS-232C Port Servicing Time
The following settings are used to determine the percentage of the cycle time
devoted to servicing the RS-232C port.
For example, if DM 6616 is set to 0110, the RS-232C port will be serviced for
10% of the cycle time.
The servicing time will be 0.34 ms minimum.
The entire servicing time will not be used unless processing requests exist.
4-7-5
Peripheral Port Servicing Time
The following settings are used to determine the percentage of the cycle time
devoted to servicing the peripheral port.
For example, if DM 6617 is set to 0115, the peripheral port will be serviced for
15% of the cycle time.
The servicing time will be 0.34 ms minimum.
The entire servicing time will not be used unless processing requests exist.
4-7-6
Cycle Monitor Time
15
0
Bit
Servicing time setting enable
00 (Hex): Disabled (5% used)
01 (Hex): Enabled (setting in bits 00 to 07 used)
Servicing time
(%, valid with bits 08 to 15 are 01)
00 to 99 (BCD, two digits)
Default:
5% of cycle time
DM6616
15
0
Bit
Servicing time setting enable
00 (Hex): Disabled (5% used)
01 (Hex): Enabled (setting in bits 00 to 07 used)
Servicing time
(%, valid with bits 08 to 15 are 01)
00 to 99 (BCD, two digits)
Default:
5% of cycle time
DM6617
15
0
DM6618
Bit
Cycle Monitor Time Enable and Units
00 (Hex): Setting disabled (time fixed at 120 ms)
01 (Hex): Setting in 00 to 07 enabled; units:10 ms
02 (Hex): Setting in 00 to 07 enabled; units:100 ms
03 (Hex): Setting in 00 to 07 enabled; units:1 s
Cycle monitor time setting
(When bits 08 to 15 are not 00)
00 to 99 (2 digits BCD; units set in bits 08 to 15.)
Default:
120 ms.
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