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Orion 796 Iss.08 – 01/14
USING THE PC INTERFACE
The bath includes an RS422 PC interface and a special converter cable that allows use with a standard RS232 port.
When using the bath with an RS232 port it is essential that this converter cable is used. Replacement cables are
available from Isotech, part number ISO-232-432. A further lead is available as an option, Part Number ISO-422-
422 lead which permits up to 5 instruments to be daisy chained together.
The benefit of this approach is that a number of calibration baths may be connected together in a "daisy chain"
configuration - and then linked to a single RS232, see diagram.
Note: The RS 422 standard specifies a maximum lead length of 1200M (4000ft). A true RS422 port will be required
to realise such lead lengths. The Isotech conversion leads are suitable for maximum combined lead lengths of 10M
that is adequate for most applications.
CONNECTIONS
For RS232 use simply connect the Isotech cable, a 9 to 25 pin converter is included to suit PCs with a 25 pin serial
converter.
RS422 Connections
Pin
Connection
4
Tx+ A
5
Tx- B
8
Rx+ A
9
Rx- B
1
Common
