Specifications

6 ζ ZETA6104 Installation Guide
Changing the COM 2 Connector from RS-232 to RS-422/485
COM 2
+5V
GND
Rx
Tx
SHLD
Rx+
Rx–
Tx+
Tx–
GND
RS-232 (factory default)
RS-422/485 (optional)
RS-232C Users
The ZETA6104's COM 2 port is factory configured for RS-232C
communication (use the left-hand pin descriptions). If you
do not
need to use RS-422/485 communication, you may ignore this
section and proceed to the
Mounting instructions.
Heatsink
Remove the two retainer screws.
(one on the top of the chassis,
one on the bottom of the chassis)
Slide the chassis forward, then
away from the heat sink.
(follow the dashed arrow)
Be careful not to catch
the 50-pin header clips
on the chassis.
Chassis
O
N
1234
DIP switch #4: Rx Termination Resistor...........120 Ω
DIP switch #3: Tx+ Bias Resistor.....................681 Ω
DIP switch #2: Tx Termination Resistor...........120 Ω
DIP switch #1: Tx– Bias Resistor.....................681 Ω
NOTE: Set the switches to ON (as illustrated) to use the internal resistors. Do this for a single unit or for the
last unit in a multi-drop only. If these resistor values are not appropriate for your application, set the switches
to OFF and connect your own external resistors. See page 9 for resistor calculations and wiring instructions.
COM 2 port for RS-422/485, set JU1-JU5 to position 1 (as illustrated).
COM 2 port for RS-232, set JU1-JU5 to position 3 (factory default).
RS-422 (or RS-232): Leave JU6 set to position 3.
RS-485 Multi-Drop: Set jumper JU6 to position 1 on all units, as illustrated
(selects half duplex and disables power-up messages, error messages, & echo).
Set the jumpers.
Set the DIP switches.
Reattach the chassis and replace the two retainer screws.