RXB PLUS ROTARY SCREW COMPRESSOR UNITS S70-101 IOM
Page 27
OPERATION
MICROPROCESSOR TELECOMMUNICATION
The Frick RXB PLUS Microprocessor comes with an on-
board telecommunication interface. The telecommunication
feature permits interfacing the microprocessor with a mo-
dem, remote data communications terminal, or master com-
puter via RS-422 protocol. In the case of a modem, tele-
phone lines are used for the actual transmission of data,
permitting communication from a remote location.
The components necessary to utilize the telecommunica-
tion feature will vary with the application. Information
concerning these items may be obtained from Frick Com-
pany, 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 dis-
abled. ID Codes from [01] thru [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 capacity control command.
D = Compressor 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
Positionof returned data
1,2,3 Capacity control position.
4 Remote, Auto, Manual (Cap control)
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 Acknowledgement of command sent.
2,3 ID code of compressor.
(Carriage return, line feed.)
COMPRESSOR STOP COMMAND: #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 Acknowledgement of command sent.
2,3 ID code of compressor.
(Carriage return, line feed.)
COMPRESSOR SLIDE VALVE #01VLXX
CONTROL COMMANDS: #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 compres-
sor #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 Acknowledgement 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.
MICROPROCESSOR OUTPUT DATA CODE
A 3.5 KOHM, 10 watt resistor (RES) must
be field installed, as shown below, when
the 120 VAC outputs of the RXB PLUS are
driving 120 VAC solid state input devices
such as programmable controllers.
PROGRAMMABLE CONTROL
DATA CODE BIT 3
DATA CODE BIT 2
DATA CODE BIT 1
DATA CODE BIT 0
RES
NEUTRAL
OUTPUT
HOT
5
16
15
14
13
31
32
33
34
47
45
46
44
42
43
41
48
RES
RES
RES
PROGRAMMABLE CONTROL
PROGRAMMABLE CONTROL
PROGRAMMABLE CONTROL
OUTPUT
OUTPUT
OUTPUT
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