User Guide – PERC2000 System Controller
Publication 81-9059-0605-0, Rev. B
November 2010
Proprietary Information of
PESA PESA 8-14
Terminator
Terminator identifies the character(s) used to denote the end of a data packet or command
string. Three terminators are available:
• CR - A carriage return.
• LF - A line feed.
• CRLF - A carriage return followed by a line feed.
Requestor Code
A Requester Code is used in conjunction with Lock Priority to determine if a lock or protect
function can be removed. When a lock or protect has been assigned by a port (or panel), it can
only be removed by another port (or panel) with a higher lock priority or with the same lock
priority and same requester code.
Requester codes not explicitly defined automatically default to 1024, 1025, and 1026 for Ports
1, 2, and 4 respectively.
The acceptable range of requester codes is 1 - 65535.
Lock Priority
Lock Priority is used in conjunction with Requester Code to determine if a lock or protect
function can be removed. When a lock or protect has been assigned by a port or panel, it can
only be removed by another port or panel with a higher lock priority, or with the same lock
priority and same requester code. The lower the lock priority number, the higher the priority.
Port lock priorities not explicitly defined automatically default to “0” which gives absolute
authority to clear any lock or protect on the system. The acceptable range of lock priorities is
0-255 (“0” is Highest Priority).
Port Type
This pull down menu allows you to assign either the RS-422 or RS-232 operational protocol to
the bus being configured.
Baud Rate
Baud rate is the data transfer rate through the serial port measured in Baud (bits per second). A
baud rate of either 9600 or 38400 may be assigned to any of the serial buses.
Stop Bits
In asynchronous communications, a stop bit indicates that a byte of data has just been
transmitted. Every byte of data is preceded by a start bit and followed by a stop bit.
Either 1 or 2 stop bits may be selected for each of the serial ports.
Flow Control
Flow Control is a serial data stream parameter that specifies a control method for data
transmission. Flow control options available through a pull-down menu in PERC2000 include
RTS/CTS, XON/XOFF or NONE.
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