Terminating resistors
RS485 lines must be terminated at both ends with
120-Ω resistors in order to prevent reflections. These
resistors are fitted on the interface converter and the
PCPU-2. They must be switched on using DIP swit-
ches. This is normally carried out on the interface con-
verter of the control unit and on the PCPU-2 of the
chromatograph which is farthest away.
Participant number of
chromatograph in network
There are two rotary switches STATION x1
and STATION x16 on the PCPU-2. The chro-
matograph number in the network is set on
these switches. Numbers from 1 to 15 are
valid.
Always set the switch STATION x16 to 0, and
set a number from 1 to 15 on the switch STA-
TION x1 . The letters A, B, C, D, E, F corre-
spond to the numbers 10 to 15.
Local operation
The participant number in the network is also
effective if you wish to operate locally with
the laptop. Only exception: if a ChromLAN
network is not operated on the interface
SER. 2, the driver UNIDRV2 is loaded there.
The chromatograph then always has the par-
ticipant number 1 at the interface SER. 2.
CAUTION:
A participant number of 00 must not be set!
The PCPU-2 is in service mode if both switches
are set to 0.
Loadable interface drivers
There are loadable drivers for all four interfaces. These
are loaded into the PCPU-2 when the control software
is programmed. Refer to The software: Installation of
software.
Supplied PCPU-2 status without control software:
Interface Standard Baud rate
SER. 1
SER. 2
SER. 3
SER. 4
RS232
RS232
RS232
RS232
9600 baud
9600 baud
9600 baud
38400 baud
Standard drivers loaded:
Interface Driver Purpose
SER. 1
SER. 2
SER. 2
SER. 3
SER. 4
UNIDRV1
UNIDRV2
TTYCLAN2
485CLAN3
485CLAN4
ChromLAN or printer
Laptop, participant number 1
ChromLAN
ChromLAN
ChromLAN
With the driver UNIDRV2, the chromatograph al-
ways has the participant number 1, independent of
the switches Station.
SER.4 SER.3
TIMEOUT
RESET
PROG.
X 16 Station X 1 RUN
SER.4 SER.3 SER.2 SER.1
SER. 2
SER. 1
SER. 3
SER. 4
DIP
ON
Station x1
Station x16
switch
X6
X7
X 9
X 8
X11
X10
18
PCPU-2 interface Jumpers
SER. 3
SER. 4
X6
X7
1 1
without terminating resistorwith
ChromLAN networks
22
3VERDRAH.CHP, Stand Dezember 22, 1999
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