C
HEETAH
864XR
V
IDEO
M
ATRIX
S
WITCHER
Publication 81-9059-0595-0, Rev. C
October 2010
Proprietary Information of
PESA
3-15
•
COM 1 is the primary RS-232 CPU Link and may be connected to a PC running the Cheetah
Control System software, such as PERC2000, with a null modem cable (Part No. 81-9028-
0393-0). Alternatively, COM 1 may be connected to an external control device.
COM 1 may only be used with the P1E protocol 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 1 in the
software matches the baud rate selected on the circuit card (in the software, select System >
Communications).
•
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 3-4 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 system control software matches the baud
rate selected on the circuit card (in the software, select
System > Communications
).
Table 3-4 - CPU Link Protocols
PROTOCOL
PESA DOCUMENT #
CPU Link Protocol No. 1 Extensions (P1E)
81-9062-0408-0
Unsolicited Status Protocol (USP)
81-9062-0409-0
3.9.2
RS-422
C
ONTROL
C
ONNECTORS
COM3/PRC
AND
COM4
Connectors COM 3/PRC and COM 4 (see Figure 3-11) are DB-9 male connectors that provide RS-
422 serial communication interface points. Pin-outs are shown in Tables 3-5 and 3-6.
1
2
3 4
5
6
7
8
9
ALARM
SYSTEM CONTROL
ALARM
RCP PANEL PORT
4
3
2
1
OUTPUT
MONITOR
AUX FRAME CTRL
SLOT B
3
SLOT A
REFERENCE
1
1
2
4
2
FRAME
ALARM
3
4
PRC LOOP
COM 1
COM 2
1
2
3
4
5
6
7
8
9
COM 4
COM 3 / PRC
COM 4
COM 3 / PRC
NETWORK
FRAME
CONTROL
SYSTEM
CONTROL
Figure 3-11 - RS-422 COM 3/PRC and COM 4 Control Connectors
COM 3/PRC is the system control communications interface with other PESA routing switchers
within the facility using the PESA Router Control (PRC) control protocol and is connected between
PRC routers using a serial control cable. Refer to Table 3-5 for pin assignments.