2. Technical Description
18
Serial Interfaces
COM 1
HX3040
Connector
DB9 shielded female
Physical interface
RS-232C or RS-485 (depending on the connected cable)
Communication direction
RS-232C: full duplex
RS-485: half duplex
Maximum number of RS-485
transceivers
32
RS-485 termination
No (allows the use of external active termination)
Modem signals
RTS, CTS, DCD
Baud rate
600, 1.200, 1.800, 2.400, 4.800, 9.600, 19.200, 38.400, 57.600,
115.200 bps
Protocols
MODBUS RTU (Master/ Slave)
Open protocol
Table 2-5. Serial Interface COM 1
COM 2
HX3040
Connector
DB9 shielded female
Physical interface
RS-422 or RS-485 (depending on the selected cable)
Communication direction
RS-422: full duplex
RS-485: half duplex
Maximum number of RS-422
transceivers
11 (1 sender and 10 receivers)
Maximum number of RS-485
transceivers
32
Termination
Yes (optional via cable selection)
Baud rate
600, 1.200, 1.800, 2.400, 4.800, 9.600, 19.200, 38.400, 57.600,
115.200 bps
Protocols
MODBUS RTU (Master/ Slave)
Open protocol
Table 2-6. Serial Interface COM 2
Notes:
Physical interface:
Depending on the cable configuration, it is possible to choose the type of
physical interface: RS-232C or RS-485 to COM1, and RS-422 or RS-485 to COM2.
Maximum number of RS-422 transceivers:
The maximum number of RS-422 interfaces that can
be used on the same bus.
Maximum number of RS-485 transceivers:
The maximum number of RS-485 interfaces that can
be used on the same bus.