Peekel Instruments User manual PICAS V2.6.1
Page 21 of 59
2.4.3 RS485 interface
The RS-485 interface connector is used to build a network (bus) between 2 or more PICAS
units. By using System menu 02, this communication can be established.
Connections shall be made on a 1-to-1 basis with twisted-pair lines. The SYNC connection
is to synchronize the oscillator frequencies of the various units. The cable used for this
connection, must have separated shielded twisted pairs for the communication lines and
the sync lines, to avoid interference between the communication and synchronization
signals. If not used, sometimes the measuring might be disturbed.
pin 1 : do not use this connection
pin 2 : Ground
pin 3 : DATA -
pin 4 : SYNC -
pin 5 : Signal Ground
pin 6 : -
pin 7 : -
pin 8 : DATA +
pin 9 : SYNC +
Cable screen should be connected to the connector case. Do not connect to pin 5!
Note: on the PICAS with the fast controller only 1 RS485 connector is present. A separate external adapter
can be ordered which holds 2 RS485 connectors.
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