Eurotech ZyWAN, User Manual

Page: 19 / 130

PART 1: GETTING STARTED
19 110150-1001F
The following wiring diagrams show the correct device connection arrangements.
Master Device
Middle
Device(s)
End Device
TX+
TX-
RX+
RX-
GND
RX+
RX-
TX+
TX-
4-wire RS-485/422 Device Connections
End device (and RS-485 Master) may need 120 ohm termination resistor,
optional middle device(s) must not have resistor.
Drawing is labeled as if devices are DTE. Direction of arrows is correct,
regardless of RX/TX labeling on a given device.
RX+
RX-
TX+
TX-
Drg. S15037-02b
(Optional)
4-wire to 2-wire RS-485/422 Device Connections
End device (and RS-485 Master) may need 120 ohm termination resistor,
optional middle device(s) must not have resistor.
Drawing is labeled as if devices are DTE. Direction of arrows is correct,
regardless of RX/TX labeling on a given device.
Drg. S15037-02c
Middle
Device(s)
End Device
Data+
Data-
Data+
Data-
Master Device
(4-wire)
TX+
TX-
RX+
RX-
GND
(Optional)
USB
One or both of the USB ports may be used internally for EvDO or WiFi. EvDO uses the top USB port
internally, and it is unavailable externally. An older WiFi option used the bottom USB port internally, but the
WiFi option now uses an internal PCMCIA card. If the ZyWAN includes either of these hardware options, the
external USB socket will be plugged to indicate the port is in use, and it must not be used for external
equipment.