
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
.
163
•
COM 2 is a secondary RS-232 CPU Link, which may also be connected to a PC or an external
control device. COM 2 may be used with either of the protocols shown in Table 37 and may
operate at either 9600 or 38,400 baud. Set the baud rate with a switch on the controller board.
Make sure the communication rate for COM 2 in the 3500 Series software matches the baud
rate you are using (in the software, select
System > Communications
).
TABLE 37: PESA CPU Link Protocols
PROTOCOL
DOCUMENT #
CPU Link Protocol No. 1 Extensions (P1E)
81-9062-0408-0
Unsolicited Status Protocol (USP)
81-9062-0409-0
11.9.2
RS-232 Control Connectors COM3/PRC and COM4
These DB-9 Male connectors (see Figure 74) provide RS-422 serial communication interfaces.
ALARM
SYSTEM CONTROL
ALARM
RCP PANEL PORT
4
3
2
1
NETWORK
OUTPUT MONITOR
AUX FRAME CTRL
SLOT B
3
SLOT A
REFERENCE
1
1
2
4
2
FRAME
ALARM
FRAME
CONTROL
SYSTEM
CONTROL
3
4
PRC LOOP
COM 4
COM 3 / PRC
COM 1
COM 2
FIGURE 74: RS-232 COM 3/PRC and COM 4 Control Connectors
COM 3/PRC is the communications interface to a PRC type routing switcher system and is connected
to a routing switcher with a serial control cable (refer to Table 38 for pin assignments).
TABLE 38: COM 3/PRC Pin Assignments
Pin
Signal
In/Out
1
CTS+
Input (not used)
2
Bi-directional
3
CTLR-
Output
4
RTS-
Output (not used)
5
Ground
---
6
CTS-
Input (not used)
7
MATRIX-
Bi-directional
8
CTLR+
Output
9
RTS+
Output (not used)
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