SmartSwarm 300 Series
:
39
2
Tx+
Tr (Do not connect)
Output
3
Rx-
Receive -
Input
4
Rx+
R
Input
Table 9. RS-485 pinout
NOTE: this device will only operate in Passive (receive-only) mode. It is not possible to configure it as a Modbus
Master, or for it to transmit on the Modbus network.
The RS-485 port provides a transmitter and a receiver. If you connect the transmitter to your Modbus
network, you risk interfering with the Modbus communication should the transmitter ever become
enabled by software. On this device, the transmitter is not enabled. Nevertheless, we recommend
that you do not connect pins 1 and 2.
CONNECT ONLY TO THE RECEIVER, AS SHOWN ABOVE.
4.5.2 RS-232 CONNECTION
RS-232 connector (5 pin)
PIN
Signal
Direction
1
CTS
Output