User Manual
Industrial Ethernet Serial Gateway
Modbus Serial/TCP Series
WWW.SSTCOMM.COM
11
②
Transmission rate: 1200 bps~115.2Kbps.
③
Media: Shielded twisted-pair cable and also can cancel the shielding, depending on environmental
conditions (EMC).
④
Site numbers: 32 stations per subsection (without repeater), and can up to 127 stations (with RS485
repeater).
⑤
Plug connection: 3-pin pluggable terminal.
2. The main points on RS485 transmission equipment installation
①
All the equipment are connected with RS485 bus;
②
Subsection can be connected up to 32 sites;
③
The farthest end of each bus has a termination resistor—120Ω 1/2W to ensure reliable operation of the
network.
D+
D-
GND
1
2
3
485+
485-
RS485 device
RS485 interface
RS485 device
RS485 device
485+
485-
485+
485-
…
