ChromLAN networks
There are so many possibilities for generating networks
with ChromLAN that no generally-applicable rules can
be specified here. Anyhow we differentiate TTY net-
works and RS485 networks. You can find more details
on the networking facilities in the register Software and
networking.
Please also read the following topics on the next pages:
Pin assignments of PCPU interfaces SER. 1 to
SER.4
Participant number of chromatograph in network
Loadable interface drivers
Adjustment of transmission rate (baud rate)
ChromLAN networks
Interface converters
Because the control units do not have RS485 interfaces,
the RS232 interface of the control unit must be con-
verted.
Set switches at the converter as shown in the draw-
ing.
Connect interface converter to socket com1: of the
control unit. The cable is included in the delivery of
the converter.
Connect the chromatographs to the converter. The
number of chromatographs connected to one con-
verter must not exceed 15. For connection diagram
please refer to register External piping and wiring
diagrams.
On every chromatograph: adjust rotary switch for
participant number in network. All chromatographs
must have different participant numbers!
With RS485 networks: activate terminating resistor
on the PCPU-2 of the last chromatograph.
Connect power cable of the converter or power sup-
ply respectively to power socket.
Below is an example of how the control unit, interface
converter and chromatographs must be connected
together.
DCE
DTE
Moni
RTS
RS232
25 pin D-Sub female
Tx On
Rx On
T-RTS
R-RTS
T-RTS
Rx On
RS485
1 2 3 4
a b
Interface converter RS232 to RS485
RTS
GND
RxD
TxD
2 3 5 7
RTS
GND
RxD
TxD
RS232
com1:
Control unit
Converter
RS485
Terminatin
resistor
b
a
a b
PGC 302
edition II
Interface SER.3
26 27
a b
PGC 302
edition II
Interface SER.3
26 27
230V
L
PE
N
a b
RGC 202
edition II
Interface SER.3
17 16
Terminatin
resistor
ChromLAN with RS485
ChromLAN networks
20
3VERDRAH.CHP, Stand Dezember 22, 1999
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