QUANTUM™ HD COMPRESSOR CONTROL PANEL
COMMUNICATIONS SETUP
090.040-CS (JAN 14)
Page 12
CONFIGURATION
Communications - Serial
ACCESSING:
Serial
Communications
DESCRIPTION: This screen is used to set the Serial communi-
cations parameters for Comm1, Comm2 and Comm 3.
NOTE: Comm1 and Comm2 may be either RS422 or RS485,
Comm3 must be RS-485 only.
The following setpoints are provided (these settings are identi-
cal for Comm1, Comm2 and Comm3:
COMM1 (2 AND 3)
Status - Shows the current communications status of
the port. The possible messages are:
• Off - No communications are currently tak-
ing place. NOTE: A delay of 15 seconds or
more of inactive communications (time be-
tween valid responses) will cause this mes-
sage to display.
• Active - Valid communications are actively
occurring.
• Failed - An invalid command was received
by the port. This could be due to a bad
checksum value, a wiring issue, or hardware
problem at either the transmitting (host) or
receiving (Quantum™ HD) end.
[Baud Rate] - The baud rate defines the speed at
which external communications can occur. The high-
er the baud rate, the faster the communications. A
pop-up menu is provided to select from the follow-
ing:
• 1200
• 2400
• 4800
• 9600
• 19200
• 38400
• 57600
• 115200
[Data Bits] - The number of bits in a transmitted data
package. A pop-up menu is provided:
• 7
• 8
[Stop Bits] - A bit(s) which signals the end of a unit
of transmission on a serial line. A pop-up menu is
provided to select from the following:
• 1
• 2
[Parity] - Parity checking refers to the use of par-
ity bits to check that data has been transmitted ac-
curately. The parity bit is added to every data unit
(typically seven or eight data bits) that is transmitted.
The parity bit for each unit is set so that all bytes have
either an odd number or an even number of set bits.
Parity checking is the most basic form of error detec-
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