TEWS TQMC400 4 Channel Full-Modem RS232/RS422/RS485 Programmable Serial Interface

Application Information

The TQMC400 is a VITA 93.0 compatible Small Form

Factor Mezzanine Card (QMC) offering 4 UART channels

with multiprotocol transceivers. Each channel can be

programmed to operate as an RS232. RS422/RS485 full

duplex or RS485 half-duplex interface.

Each RS232 channel supports RxD, TxD, RTS, CTS,

DTR, DSR, CD, RI and GND. RS422 and RS485 full

duplex supports a four wire interface (RX+, RX-, TX+, TX-)

plus ground (GND). RS485 half-duplex supports a two

wire interface (DX+, DX-) plus ground (GND). On-chip

switchable termination of 120Ω is provided for the

RS422/RS485 interfaces.

Selectable data rates are up to 1 Mbps for RS232 mode

and 20 Mbps for RS422/RS485 half-duplex and full-duplex

mode. Additionally a reduced slew rate mode with lower

EMI provides data rates with max. 250 kbps for RS232

and max. 500 kbps for RS422/RS485.

Each channel has 256 byte transmit and receive FIFOs to

significantly reduce the overhead required to provide data

to and get data from the transmitters and receivers. The

FIFO trigger levels are programmable. The UART offers

readable FIFO levels.

Software Support (TDRV002-SW-xx) for different

operating systems is available.

The TQMC400 is available as air cooled and conduction

cooled variant.