ELC500 Control unit
196
COM1 / 2 port (RS-485 / RS-422) Communication
11.5.3
Item
Specification
Initial setting
Interface
2-wire system RS-485/ 4-wire system RS-422 *2
RS-485
Port number
2CH
-
Transmission type
1:N
-
Communication method
Half-duplex
-
Synchronous method
Asynchronous communication method
-
Transmission
distance
RS-485
Max. 1,200m *3
-
RS-422
Max. 400m
-
Transmission speed
300 / 600 / 1,200 / 2,400 / 4,800 / 9,600 /
19,200 / 38,400 / 57,600 / 115,200 / 230,400 [bps]
19,200
Transmission
format
Stop bit
1bit / 2bit
1bit
Parity
Odd / Even / None
Odd
Start code
With STX / No STX
No STX
End code
CR / CR+LF / None / ETX
CR
Data length
7bit / 8bit *6
8bit
Protocol : Connected number
*4 *5
MEWTOCOL (master / slave): max. 99
MODBUS RTU (master / slave): max. 99
General-purpose: max.99 *8
PLC link: max. 16 *8, *9
MEWTOCOL
*1 Please check with the actual devices when some commercial devices with RS-485/RS-422 interface
are connected. The number of connected devices, transmission distance, and transmission speed
may be different according to using transmission line.
*2 RS-485/RS-422 can be changed with serial mode switch.
*3 Transmission distance is limited as below according to transmission speed and number of connected
unit. With under 38400bps, max. distance is 1200m and max. number is 99 units.
*4 When using SI-35, SI-35USB or Eco-POWEREMTER, PLC from our company (which can be
connected up to 99 units), up to 99 unit s can be connected.
*5 For RS-422 1:1
*6 8 bit fixed for MODBUS RTU
*7 Each terminal of RS-485/RS-422 port is insulated to internal circuit.
*8 Programming tool (Control FOWIN Pro7) is necessary.
*9 Only COM1 port is supported for PLC link.
Transmission distance
Transmission speed: 115.2kbp
1200
1000
700
(
m
)
0
99
70
40
U
ni
t num
ber