C168H Series

8-port RS-232 ISA serial boards

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Evaluation units available for online purchase
>> Buy now (USA only)

Phase-out and Last Buy Notice

The C168H Series will be discontinued starting from July 1, 2017 . The deadline for placing a final purchase order is December 1, 2017. Due to the limited availability of these products, orders will be processed till we run out of stock.
For alternative solution, please 
visit our ISA Serial Boards.


Features and Benefits 

  • Compact ISA boards with 8 RS-232 ports
  • 921.6 kbps maximum baudrate for super fast data transmission
  • 16-byte FIFO and on-chip H/W flow control
  • Choose from a wide range of connection cables and boxes
  • Drivers provided for Windows, Windows XP Embedded, DOS, Linux 2.4, 2.6, 3, QNX 4/6, FreeBSD, SCO OpenServer UnixWare 7, Solaris 10
  • Easy configuration, without switches or jumpers



The 8-port C168H/HS ISA boards offer users a basic, high performance multiport serial communication solution for connecting terminals, modems, printers, data acquisition equipment, and other serial devices to a PC. The boards are a top choice of industrial automation engineers and system integrators, and support many different operating systems, including Windows, Linux, and even Unix. In addition, each of the 8 RS-232 ports supports a super fast 921.6 kbps baudrate.

Comm. Controller 16C550C or compatible x 8
Bus 16-bit ISA
Connector DB62 female
Serial Interface
Number of Ports 8
Serial Standards RS-232
Max. No. of Boards per PC 4
Serial Line Protection
Electrical Isolation 500 V with connector Opt8F (must be purchased separately)
Baudrate 50 bps to 921.6 kbps
Serial Communication Parameters
Data Bits 5, 6, 7, 8
Stop Bits 1, 1.5, 2
Parity None, Even, Odd, Space, Mark
I/O Address 0x0000-0xFFFF (default = 0x180)
IRQ 2 (9), 3, 4, 5, 7, 10 (default), 11, 12, 15
Serial Signals
Physical Characteristics
Dimensions 93 x 157 mm (3.66 x 6.18 in)
Driver Support
Windows Windows 95/98/ME/NT/2000, Windows XP/2003/Vista/2008/7/8/8.1 (x86/x64), Windows 2008 R2/2012/2012 R2 (x64), DOS, Windows Embedded CE 5.0/6.0, Windows XP Embedded
Linux Linux 2.4.x, 2.6.x, 3.x
Unix-like Systems QNX 6, SCO OpenServer, UnixWare 7, Solaris 10, FreeBSD
Note Please refer to Moxa’s website for the latest driver support information.
Environmental Limits
Operating Temperature 0 to 55°C (32 to 131°F)
Storage Temperature -20 to 85°C (-4 to 185°F)
Ambient Relative Humidity 5 to 95% (non-condensing)
Standards and Certifications
EMC EN 55032/24
EMI CISPR 32, FCC Part 15B Class B
EMS IEC 61000-4-2 ESD: Contact: 4 kV; Air: 8 kV
IEC 61000-4-3 RS: 80 MHz to 1 GHz: 3 V/m
IEC 61000-4-4 EFT: Power: 1 kV; Signal: 0.5 kV
IEC 61000-4-5 Surge: Power: 2 kV
IEC 61000-4-6 CS: 150 kHz to 80 MHz: 3 V/m; Signal: 3 V/m
IEC 61000-4-8 PFMF
IEC 61000
MTBF (mean time between failures)
Time 601,501 hrs
Standard MIL-HDBK-217F
Power Requirements
Input Current 170 mA @ +5 VDC; 100 mA @ +12 VDC; 160 mA @ -12 VDC
Warranty Period 5 years
Details See www.moxa.com/warranty

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Available Models

  Model No. Description
C168H 8-port RS-232 ISA serial board
C168HS 8-port RS-232 ISA serial board with surge protection

Optional Accessories

Connection Boxes
  Model No. Description
OPT8-M9 DB62(M) to 8 x DB9(M) Connection Box
OPT8-RJ45 DB62(M) to 8 x RJ45 (8-pin) Connection Box
OPT8A DB62(M) to 8 x DB25(F) Connection Box
OPT8S DB62(M) to 8 x DB25(F) Connection Box w/ Surge Protection
OPT8B DB62(M) to 8 x DB25(M) Connection Box
Connection Cables
  Model No. Description
CBL-M62M25x8-100 (OPT8C) DB62(M) to 8 x DB25(M) Cable
CBL-M62M9x8-100 (OPT8D) DB62(M) to 8 x DB9(M) Cable

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