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SysLINK Hardware Manual
Page 16
In 485/422 mode, the pinouts are as follows:
DB-25
Pin
Number
RS-
485/422
Name
Direction
Signal Function
2
TXB/
TXD+
O
Serial data out, from remote device to SysLINK
3
RXB/
RXD+
I
Serial data in, from SysLINK to remote device
4
TXA/
TXD-
O
Serial data out, from remote device to SysLINK
5
RXA/
RXD-
I
Serial data in, from SysLINK to remote device
7
GND
Signal ground
JP8 and JP9 on the RS-232/485/422 may be installed to connect the TXD-/RXD- and
TXD+/RXD+ pairs for 2-wire mode. In 485 mode the SysLINK disables its receivers while it
is transmitting and disables its transmitters while receiving. In 422 mode the SysLINK keeps
its receivers and transmitters enabled all the time.
Note that some RS-422 and RS-485 devices refer to the differential pair of signals that make
up the transmit and receive lines as “-” and “+“ instead of the standard “A” and “B”. In most
cases, the “-” signal corresponds to the “A” signal and the “+” signal corresponds to the “B”
signal, but some devices reverse this.
Zigbee Option Card
The Zigbee Option Card provides an interface to talk to other Zigbee remote devices.
Z-Wave Option Card
The Z-Wave Option Card provides an interface to talk to other Z-Wave remote devices.
Wi-Fi Interface
The WiFi interface is a b/g/n interface that can operate in Access Point mode.
Cellular Interface
The SysLINK automatically makes a data-only connection to an available cellular network
for the carrier the SysLINK is provisioned and activated on. The cellular interface is typically
enabled by default and the SysLINK immediately attempts to connect to the cellular network
on power up. This cellular interface is typically used to connect to the public Internet or a
privately managed network.
