-
16
-
EM-481
NOVATEK-ELECTRO
Parameter
Range of
values
Factory
setting
Description
Address
Activate
selection of byte
format when
transmitting via
RS- 485
0
– 1
1
It is used in case of data exchange between the devices via
RS-485, the same value for the devices on the same bus-
bar.
0
– unused, byte is completed with 2 stop bits;
1
– Byte format is selected in register 461.
460
Byte format
when
transmitting via
RS-485
0
– 5
5
It is used in case of data exchange between the devices via
RS-485 only if byte format selection is activated.
The same value for the devices on the same bus-bar.
0
– “EVEN” – 1 parity bit and 1 stop bit;
1
– “ODD” – 1 parity bit and 1 stop bit;
2
– «0» (“SPACE”) – 1 zero bit and 1 stop bit;
3
– «1» (“MARK”) – 1 unit bit and 1 stop bit (similar to mode
with two stop-bits);
4
– "ABSENT" - no parity bit, 1 stop bit;
5
– "AUTO-STOP" - no parity bit, 2 stop bits in the sent bytes, 1
stop bit in the received bytes (in such a case, devices with one
and two stop bits may be connected simultaneously).
461
Waiting time for
starting the
MODBUS RTU
response, ms
0
– 60000
200
It is used for transmissions via RS-485 in
RTU
mode. After
transmission of query, if the first byte of the response was not
received within this time interval, the waiting for the response is
terminated.
The
response is
always
expected
to
be
not
less
than the silence time between frames (the silence time de-
pends on the transmission speed and is equal to the
transmission time of 3.5 bytes, or 1.75 ms for speeds above
19200 bps).
462
Enable ASCII
exchange mode
in MODBUS
network
0
– 1
0
Exchange mode via RS-485, the same value for all units on
the same bus-bar.
0
–
RTU
exchange mode (format: 1 start bit, 8 data bits, 2
stop-bits, parity bit, and stop bit or only 1 stop bit - total from
10 to11 bits);
1
–
ASCII
exchange mode (format: 1 start bit, 7 data bits, 2
stop-bits or parity bit and stop bit - total is 10 bits). The non-
standard byte formats (register 461, values 4 and 5) are not
available in this case, format 3 (2 stop bits) is used instead.
463
Response time
for subsequent
Modbus ASCII
character, ms
0
–
60 000
1000
It is used in case of data transfer via RS-485 in
ASCII
mode. If
you receive a response, if the next byte of the response was
not received within this time interval, then the response waiting
is stopped. Waiting is always not less than the transmission
time of one character (depends on the transmission speed).
464
Connecting to data collection server
Mode of
connection to
the server for
data collection
0
– 4
1
0
– connection to server is not used;
1
– It sets and supports connection to the server through the
specified port of the server connection (port on the server side)
through any of the available interfaces;
2
– it is expected to connect from the server through the
specified server connection port (port on the EM-481 side);
3
– similar to 1, but only via Ethernet;
4
– similar to 1, but only via GPRS.
465
Server
connection port
0
– 65535
20502
The port to which the party is addressed, making connection
between EM-481 and the server (see reg. 465).
466
Time of waiting
for response
from the server, s
0
– 3600
120
0
– the server silence time is not limited;
1
–3600 – max. time of server silence after which the
connection will be stopped and must be remade again.
467
Waiting time be-
fore reconnecting
to the server, s
0
–
30 000
15
It is used when connecting to the server (except mode "2").
After losing connection to the server, the reconnection will be
performed after the specified waiting time.
468
Enable server
address setting
with a text string
0
– 1
1
It is used when connecting to the server (except mode "2"):
0
– connection is made to the server with fixed IP-address set
in the registers 470
– 473;
1
– connection is made to the server with the name set in the
registers 474
–509.
469
Table 5.8 Continued
