External COM ports via Ethernet and Internet
3-in-1 Serial Port: RS-232, RS-422, OR RS-485
Modes: TCP Server, TCP Client, UDP
Ethernet Modem
Pair Connection
Real Com / Tty Drivers for Windows and Linux
2-wire RS-485 with Patented Automatic Data Direction Control (Addc®)
Built-in 15 kV ESD Protection for All Serial Signal

Moxa A53, DB9 W/ADAPTER

External COM ports via Ethernet and Internet
Compact and but finding room for
Socket Modes: TCP Server / TCP Client / UDP
Windows Utility for Configuring Multiple Device Servers
Supports 10 / 100m Ethernet
2 x DB9 male
SNMP MIB-II for Network Management
Power supply included

Industrial RS232 to 422/RS485 Serial Converter/ Repeater with 2 KV Isolation, MOXA TCC-100i

RS-232 to RS-422 conversion with RTS/CTS support 
RS-232 to 2-wire or 4-wire RS-485 conversion 
2 KV isolation protection (TCC-100I/TCC-100I-T) 
Wall and DIN-rail mounting 
Plug-in terminal block for easy RS-422/485 wiring 
LED indicators for power, Tx, Rx 
-20 to 60°C operating temperature

16 ports RS232/422/485  Serial Device Server
10/100Mbit
MOXA NPort 5650-16
19" Rack mount
Seriel Port Server

1 port LTE serial to Ethernet gateway / modem, RS232 / 422/485

GSM / GPRS / EDGE / UMTS / HSPA / LTE
Supports VPN and virtual comport
Operating temperature -30 -70 ° C 
IP30 
Supplied via the 12-48 VDC
DIN rail mounting (bracket supplied)