Pfeiffer Vacuum ACP 28 CP, Руководство по эксплуатации

Страница: 26 / 56

Description Set Point
Stop bit 1
Echo no
Tbl. 3: Default serial link configuration
1 5 6 7 2 3 4
9 10 15 14 13 12 11
8
V+(A) V-(B)
+5 V-10 mA max.
(RS-485) (RS-485) GND
Fig. 5: Male 15-pin RS-485 connector
Pin Assignment
8 GND
3 RS-485: V-
2 RS-485: V+
1 +5 VDC -10 mA max (only for RS-485)
It is the user’s responsibility to use shielded links and connections in compliance with EMC and electri-
cal safety standards.
RS-485 connection
A computer manages several pumps (P1, P2, Pn, etc.) using the RS-485 serial link via the RS-485 con-
nector. This parallel wiring allows communication between the pumps even if a pump is disconnected.
The wiring of the product at the end of line Pn* and the wiring of a single product on the network is spe-
cific (see figure below).
1
2
3
4
8
9
15
1
2
3
4
8
9
15
1
2
3
4
8
9
15
RS-485
communication
box
P1 P2 Pn*
1
,5
k
Ω
/
1
/4
W
1
,5
k
Ω
/
1
/4
W
5.6.2 Setting
When the wiring is done, to allow pump control via serial link, proceed as follows:
1. Set the main switch to I .
2. Send an order via the serial link: this order has no priority on remote control mode via dry contacts
The 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
Parameter The number of characters depends on the command
End character This is the message end character. Default setting: ASCII code 13 <CR>
Installation
26/56