RWB II PLUS MICROPROCESSOR CONTROL
OPERATION
S70-200 OM
Page 16
MICROPROCESSOR
TELECOMMUNICATIONS
The following details are typical
and may or may not match the soft-
ware supplied on your compressor.
The telecommunications capabilities are continuously
being expanded and improved. Therefore, you MUST con-
sult FRICK Company for the exact details on your par-
ticular unit(s) before developing system software to in-
terface with your compressors.
The Frick RWB II PLUS Microprocessor comes with an on
board telecommunications interface. The telecommunica-
tions feature permits interfacing the microprocessor with a
modem, remote data communications terminal, or master
computer via RS-422 protocol. In the case of a modem, tele-
phone lines are used for the actual transmission of data
permitting communications from a remote location.
The components necessary to utilize the telecommunica-
tions feature will vary with the application. Information con-
cerning these items may be obtained from Frick Company,
Waynesboro, Pa.
COMMUNICATIONS PROTOCOL
SPECIFICATIONS:
All commands must be in ASCII (CAPS) to be recognized. A
compressor with an ID code of [00] is considered disabled.
ID Codes from [01] through [99] are valid and are recog-
nized by the microprocessor.
The following is a complete list of available command types:
COMMAND CODE and DESCRIPTION
I = Returns compressor status information.
R = Compressor start command.
S = Compressor stop command.
V = Compressor slide valve control command.
D = Compressors display screens command.
P = Return Pressures information.
T = Return Temperatures information.
A = Return full load amps information.
C = Enter Change setpoints mode.
The following is a detailed description of each command:
RETURN COMPRESSOR STATUS INFORMATION: #01I
# Start of command sequence.
01 Compressor ID code.
I Return Status information command.
RETURNED ANSWER, ie: 090RRRN340
Character Description
Position of returned data
1,2,3 Slide valve position.
4
Remote, Auto, Manual (slide valve)
5
Delay-recycle, Running, Off.
6
Rem, Man, Off, Auto (Compressor mode)
7
Cutout, Alarm, Normal.
8,9,10 Suction in PSIA.
(Carriage return, line feed.)
COMPRESSOR START COMMAND: #01R01
# Start command sequence.
01 Compressor ID code.
R Start compressor command.
01 ID code repeated for verification
NOTE: The compressor must be in the remote
start mode for this command to be executed.
Returned answer: A01
Character Description
Position of returned data
1
Acknowledge of command sent.
2,3
ID code of compressor.
(Carriage return, line feed.)
COMPRESSOR STOP COMMANDS: #01S01
# Start command sequence.
01 Compressor ID code.
S Stop compressor command.
01 ID code repeated for verification
NOTE: The compressor must be in the remote
start mode for this command to be executed.
RETURNED ANSWER: A01
Character Description
Position of returned data
1
Acknowledge of command sent.
2,3
ID code of compressor.
(Carriage return, line feed.)
SLIDE VALVE CONTROL COMMANDS: #01VLXX
#01VUXX
#01VS
# Start command sequence.
01 Compressor ID code.
V Compressor control command.
L Load Slide valve command.
U Unload slide valve command.
XX = 00 Turns selected output off.
XX = 01 to 15 Turns selected output on
for XX seconds.
XX = 99 Turns selected output on.
S Return slide valve position value.
If the command was #01VL00, then the load
slide valve output on compressor #1 would be
turned off. If the command was #01VL05, then
the load slide valve output on compressor #1
would be turned on for 5 seconds, and would
then automatically turn off. NOTE: the slide
valve must be in the remote mode for this
command to be executed.
RETURNED ANSWER (for L or U commands): A01
Character Description
Position of returned data
1
Acknowledge of command sent.
2,3
ID code of compressor.
(Carriage return, line feed.)
RETURNED ANSWER (for S command), ie. 090
1,2,3 Slide valve position.
