SENS.413347.015RE
29
otherwise not specified in purchase order).
8.4.2.12 Configuration of triggering inversion for signal relays
Inversion of relay triggering determines position of relay contacts upon occurrence of
event (closed or opened).
Inversion is determined by parameter
cb
(Settings 3).
Parameter
cb
consists of two bits. First bit determines inversion of relay 1, second bit
determines inversion of relay 2. If bit is not set (short vertical line on MS-K-500-3 display) -
inversion is disabled. If bit is set (long vertical line on MS-K-500-3 display) - inversion is
enabled.
Disabled inversion corresponds with closed state of relay contacts in absence of event.
Viewing of
cb
parameter values is available for operation modes with "user" and
"administrator" access level.
To set values of parameter
cb
, "administrator" access level is required.
Configuration is performed as follows:
- enter configuration menu;
- run command
C231
(enter administrator mode);
- select
SEtt
menu item;
- select
cb
menu item;
- set required bits;
- scroll to
End
item and exit with saving parameters;
- run command
C230
(exit administrator mode).
Value of parameter
cb
must be recorded in the table of configuration parameters of gas
detector configuration data sheet. Factory setting of
cb
parameter is disabled inversion (unless
otherwise specified in purchase order).
8.4.2.13 Setting of number of parameter sent in burst mode
To provide burst data exchange mode with automation systems, gas detector allows
sending code and value of measured parameter together with status byte. In burst mode,
speed of relay triggering is reduced, but it increases data transfer rate. It allows to reduce time
that automation controller needs for interrogation. Gas detector allows for sending with status
byte either parameter Concentration, % LFL (No. of parameter = 0x10), or Concentration, %
vol. fraction (No. of parameter = 0x0D).
With disabled burst mode, status byte packet is as follows (figure 8.5). For details see
document "SENS Devices. Exchange protocol".
PRE
A
L = 1
C
Address
(0-127)
Command
Control
checksum
CRC
Prefix
STATE
Data
length
Status byte
1 byte
1 byte
1 byte
1 byte
L byte
1 byte
Figure 8.5 - Example of status packet with disabled burst mode
When status byte packet is sent with enabled burst mode, Parameter code and its value
are added (figure 8.6):
Summary of Contents for SG-A1
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