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Technical Specifications

Supported Serial Settings​

Serial SettingSupported Values
Baud RateUp to 921,600
Data Bits5, 6, 7 or 8
ParityNone, Odd, Even, Mark & Space
Stop Bits1, 1.5 or 2
HandshakingRTS/CTS, DTR/DSR, Xon/Xoff
BreakSupported

Device Pin-out​

37 Way D Connector​

RS-232 Pinout​

RS-232 Card(s): UC-268

37-Way D Connector RS-232 Pinout

RS-422 Pinout​

RS-422/485 Card(s): UC-346 and UC-368

37-Way D Connector RS-422 Pinout

44 Way D Pin Connector​

RS-232 Card(s): UC-263, UC-260, UC-701, UC-049, UC-061, UC-072, UC-083, UC-295, UC-253, UC-734

44-Way D Connector Pinout

78 Way D Pin Connector​

RS-232 Card(s): UC-279

78-Way D Connector Pinout Part 1

78-Way D Connector Pinout Part 2

RS-232 Devices​

Standard 9-pin D connector pinout for RS-232 devices.

9-Pin RS-232 Device Pinout

RS-422/485 Devices​

Standard 9-pin D connector pinout for RS-422/485 devices.

9-Pin RS-422/485 Device Pinout

Important Notes for RS-422/485 Devices
  • DTR/DSR Handshaking is not available on RS-422/485 devices
  • For RS-422 Full Duplex communications, please note outputs above
  • To achieve RS-485 Half Duplex communications, using two wires for communication, Pins 1 and 6, 2 and 7 must be physically shorted
  • Once your wiring is setup, you will also need to set the card to FULL or HALF Duplex mode in the software. For further details, see Product Configuration

Terminating Resistors​

RS-422 and RS-485 lines should be terminated at the end of the main branch of the RECEIVER, in the cable's characteristic impedance. These terminating impedances stop echoes caused by the serial data being reflected back at the cable ends.

note

It is not necessary to terminate the transmitter end of the twisted pair.

The AT Dual Port RS-422/485, Opto Isolated AT Dual Port RS-422/485 and AT Velocity RS-422/485 cards have the correct 120 ohm (nominal) terminating resistors for the RXD twisted pair line and the CTS twisted pair line fitted on the RS-422/485 card for both the serial ports on the card.

There is no need to add any more at the PC end.

The terminating impedances shown in the wiring diagrams are automatically provided by the on-board resistors and do not have to be added by the user.

Storage and Operating Environment Guidelines​

Storage​

ParameterRange
Temperature-10 C to +70 C
Humidity8% to 95% non-condensing

Operational​

ParameterRange
Temperature0 C to +70 C
Humidity20% to 75% non-condensing