page 6 – 7
D-70 / Apr 2000
CPU & DSP
J4 - RS-485/RS-232 Select
Jumper J4 selects the hardware interface type (RS-485 or RS-232) for
serial the Com port.
OFF ON
J4 RS-485 RS-232
J1 - J3 - RS-485 Termination
Jumpers J1 - J3 are used for RS-485 termination. Termination must be
switched in pairs (i.e., TX and RX BOTH ON or BOTH OFF).
OFF ON Serial Port
J3 Not terminated Terminated TX
J1, J2 Not terminated Terminated RX
Hook-Ups
All user wiring to and from the serial interface takes place at DB-15 multi-
pin connector mounted on the rear panel.
DB-15 Connector – Digital Control Ports
Handles Com 1 serial connections.
Pin 1 – RX +
Pin 9 – RX -
Pin 10 – TX + RS-485
Pin 3 – TX -
Pin 4 – DTR
Pin 6 – RTS
Pin 7 – RX RS-232
Pin 12 – DSR
Pin 13 – CTS
Pin 15 – TX
Pins 2, 5, 8, 11 and 14 - Digital Ground
Typical DB-15
connector
6
7
8
14
15
4
5
11
12
13
1
2
3
9
10
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