Pin
Assignment
5
GND
8
RS-485: V-
9
RS-485: V+
The user must use shielded links and connections in compliance with EMC and electrical safety stand-
ards.
RS-232 connection
A computer manages a single pump (P1) using the RS-232 link via the
RS-232/RS-485
connector.
P1
RS-485 connection
A computer manages several pumps (P1, P2, Pn, etc.) using the RS-485 serial link via the
RS-232/
RS-485
connector This parallel wiring allows communication between the pumps even if a pump is dis-
connected.
The wiring of the product at the end of line Pn* and the wiring of a single product on the network is spe-
cific.
RS-485
communication
box
P1
P2
Pn*
1,5 kΩ / 1/4 W
120 Ω / 1/4 W
Configuration
The serial link control mode is active when the wiring is done and when the ‘Serial link’ control mode is
configured by the HHR (see chapter "SETUP" menu) or on the RS-232/RS-485 serial link (see chapter
"Command list').
► Set the 48 VDC power supply switch to
I
.
► Send an order via the serial link.
8.4.2 Communication protocol
Control commands
Header character
The default setting is the decimal code 035 of the character #
Address
Number given to the pump, 3 characters
Order
Command sent on serial link, 3 characters
Order
The number of characters depends on the command
End parameter
This is the message end character. The setting is ASCII 13 code
<CR>
The
<LF> character is not taken into account.
Example:
Header character
Pump address
Order
Parameter
End character
#
ADR
ODR
XXXX
<CR>
Interfaces for control
51/78
