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C
HEETAH
S
ERIES
S
WITCHERS
–
C
HAPTER
11
81-9059-0570-0
Rev. C
Proprietary Information of
PESA
S
WITCHING
S
YSTEMS
,
I
NC
.
164
COM 4 (refer to Table 39 for pin assignments) is an RS-422 CPU Link similar to the RS-232 CPU
Link, except the cable may be up to and including 4,000 feet in length and an RS-422 interface card
must be installed in the PC. COM 4 may be used with either of the protocols listed in the previous
Table 38.
TABLE 39:
COM4 Pin Assignments
Pin Signal
In/Out
1
CTS+
Input
2
RX+
Input
3
TX-
Output
4
RTS-
Output
5
Ground
---
6
CTS-
Input
7
RX-
Input
8
TX+
Output
9
RTS+
Output
11.9.3
System Control Alarm Connector
This three-pin connector, illustrated in Figure 75, provides an interface for an external, customer-
supplied, system control alarm (alarm contact locations are also shown). The 3500 Series controller
initiates a system alarm. An alarm condition is declared when the controller is in reset and when the
standby controller is gathering configuration information from the primary controller. During an
alarm condition, an optically isolated, electronically closed circuit exists between contacts 3 and 1 for
Controller A (top) and contacts 2 and 1 for Controller B (bottom). This circuit acts as a switch to
trigger an optional external alarm in the event of a controller fault or failure. The controller alarm
circuit supplies an electronic contact closure, but does not provide a voltage to the external alarm.
The customer-supplied circuitry must not exceed 12VDC @ 10mA.
The alarm is activated if any of the following 3500 Series software conditions exist:
•
Encounters an interrupt that it does not expect or can not process
•
Is unable to synchronize with the other 3500 Series controller (dual controllers)
•
Does not get the configuration from the other 3500 Series controller (dual controllers)
ALARM
RCP PANEL PORT
4
3
2
1
NETWORK
OUTPUT MONITOR
SLOT B
3
SLOT A
REFERENCE
1
1
2
4
2
FRAME
ALARM
FRAME
CONTROL
3
4
PRC LOOP
COM 4
COM 3 / PRC
COM 1
COM 2
AUX FRAME CTRL
SYSTEM
CONTROL
SYSTEM CONTROL
ALARM
FIGURE 75: System Control Alarm Connector
+ - S
1 2 3
Содержание Cheetah 1024x256
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