ETEL Doc.- Hardware Manual # DSC2P / Ver H / 6/1/11
DSC2P Hardware Manual
31
3.3
Communication connectors
Caution:
The communication connectors must be insulated (no contact) from the power and
the
mains.
The inputs and outputs of these connectors are not galvanically insulated from the
GND.
The inputs and outputs must be connected to an Extra Low Voltage circuit only
(SELV).
Caution:
The communication connectors must be handled in an ESD protected environment,
only.
Remark:
The communication cables connected to the DSC2P must be shielded (see
§3.7.1
).
The communication between a host (PC) and a DSC2P is obtained via the ETEL-Bus-Lite2 (EBL2) protocol
(refer to the
'EBL2 Communication Manual'
for more information). The communication between the DSC2Ps
is obtained via the Turbo-ETEL-Bus (TEB) protocol which needs a TEB master (DSMAX or DSTEB or DSC2P
in
μ
-master mode).
The ETEL-Bus-Lite2 protocol is open to the user. It is configured as follows:
The EBL2 transmission rate can be selected with the parameter K195 (refer to the corresponding
'Operation
& Software Manual'
for more information).
The Turbo-ETEL-Bus protocol is closed to the user who cannot have direct access to it.
The user can select the RS232 type of ETEL-Bus-Lite2 communication by connecting the
EBL2_select_232/
422
pin to the GND (0V). If this connection is not made, RS422 type is automatically selected (default status).
Remark:
If the cables provided by ETEL are used, the communication type by default is RS232.
The communication connectors are JC1, JC2, JC3 and JC4 (see the following tables).
The JC1 connector is used for the TEB data input and JC2 for the TEB data output. They are used to make a
daisy chain between controllers, simply with standard RJ-45 cables. The JC3 connector allows both types of
ETEL-Bus-Lite2 communication (RS232 or RS422), and the selection between them. The JC4 connector is
used, for the download key, to set the controller to the 'wait for program' mode; it also includes TTL signals to
indicate the states of the encoder's sine and cosine as well as the slow time interrupt (STI).
Remark:
The download key of the DSC2P is not compatible with the DSB2P key.
Transmission rate
9600 to 115'200 bps
Data length
8 bits
Start bit
1
Stop bit
1
Parity
No
Handshaking
No
ETEL-Bus-Lite2 (communication between a PC and a DSC2P)
Turbo-ETEL-Bus (communication between DSC2Ps)
RS 232
RS 422
Normal connection between a PC
and a DSC2P for communication
purposes (with
ETEL Tools
software,
e.g.).
For example, for the use of an 'on-
line' control system with a
communication system other than
RS232, or if the PC comes with a
RS422 board and its RS 232 port is
already used.
The Turbo-ETEL-Bus works at 100 Mbps and is based on
Ethernet components.
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