Instruction Manual VGC301A Controller
InstruTech, Inc.
Page 29
8.2
RS485 / RS232 Command Protocol Summary
COMMAND
BRIEF DESCRIPTION
COMMAND SYNTAX
RESPONSE
READ
Read the current pressure in Torr
#xxRD<CR>
(eg: #01RD<CR>)
*xx_y.yyEzyy<CR>
(eg: *01_7.60E+02<CR>)
SET ADDR
OFFSET
Set the communications (RS485)
address offset (upper nibble)
(1)
#xxSAxx<CR>
(eg: #01SA20<CR>)
*xx_PROGM_OK<CR>
SET SPAN
Set the span or atmosphere
calibration point
#xxTSy.yyEzyy<CR>
(eg: #01TS7.60E+02)
*xx_PROGM_OK<CR>
SET ZERO
Set the zero or vacuum calibration
point
#xxTZy.yyEzyy<CR>
(eg: #01TZ0.00E-04<CR>)
*xx_PROGM_OK<CR>
SET TRIP POINT
#1
Set the ‘turns on below’ pressure
point for relay #1 and set the
‘turns off above’ pressure point
for relay #1.
#xxSLzy.yyEzyy<CR>
(eg: #01SL+4.00E+02<CR>)
(eg: #01SL-5.00E+02<CR>)
*xx_`PROGM_OK<CR>
SET TRIP POINT
#2
Set the ‘turns on below’ pressure
point for relay #2 and set the
‘turns off above’ pressure point
for relay #2.
#xxSHzy.yyEzyy<CR>
(eg: #01SH+4.00E+02<CR>)
(eg: #01SH-5.00E+02<CR>)
*xx_PROGM_OK<CR>
READ TRIP
POINT #1
Read the ‘turns on below’
pressure point for relay #1 and
read the ‘turns off above’
pressure point for relay #1.
#xxRLz<CR>
(eg: #01RL+<CR>)
(eg: #01RL-<CR>)
*xx_y.yyEzyy<CR>
(eg: *01_7.60E+02<CR>)
READ TRIP
POINT #2
Read the ‘turns on below’
pressure point for relay #2 and
read the ‘turns off above’
pressure point for relay #2.
#xxRHz<CR>
(eg: #01RH+<CR>)
(eg: #01RH-<CR>)
*xx_y.yyEzyy<CR>
(eg: *01_7.60E+02<CR>)
READ SW
VERSION
Read the revision number of the
firmware.
#xxVER<CR>
(eg: #01VER<CR>)
*xx_mmnnv-vv
(eg: *0105041-00)
SET FACTORY
DEFAULTS
Force unit to return ALL settings
back to the way the factory
programmed them before
shipment.
(1)
#xxFAC<CR>
(eg: #01FAC<CR>)
*xx_PROGM_OK<CR>
SET BAUD RATE
Set the communications baud rate
for RS485 and RS232.
(1)
#xxSByyyyy<CR>
(eg: #01SB19200<CR>)
*xx_PROGM_OK<CR>
SET NO PARITY
Set the communications to NO
parity, 8 bits for the RS485 and
RS232.
(1)
#xxSPN<CR>
(eg: #01SPN<CR>)
*xx_PROGM_OK<CR>
SET ODD PARITY
Set the communications to ODD
parity, 7 bits for the RS485 and
RS232.
(1)
#xxSPO<CR>
(eg: #01SPO<CR>)
*xx_PROGM_OK<CR>
SET EVEN
PARITY
Set the communications to EVEN
parity, 7 bits for the RS485/
RS232.
(1)
#xxSPE<CR>
(eg: #01SPE<CR>)
*xx_PROGM_OK<CR>
RESET
Reset the device. (required to
complete some of the
commands.)
#xxRST<CR>
(eg: #01RST<CR>)
No response
(1) Commands marked with a (1) under the “BRIEF DESCRIPTION” column will not take effect until after RESET
command is sent or power is cycled. This protocol was designed to be 100% compatible with the Granville-
Phillips® Mini-Convectron®.