RAD Data comm ASMi-31 Specifikace stáhnout pdf (Strana 56)

Appendix C. X.21 Interface Module ASMi-31

Installation and Operation Manual

C-4 INT/RCV Mode

IR-X.21B

MODEM DTE

TXDTXD

ETC

RXC

RXD

Signal Timing

(2, 9)

(7, 14)

(4, 11)

(6, 13)

FIFO

Buffer

Figure C-4 EXT Mode Timing Block

C.4 INT/RCV Mode

This mode is used in applications where the IR-X.21 side uses the clock

signal from the modem link. This mode is used mainly when the attached

equipment has an IR-X.21 interface, but no ability to produce clock signals.

The module has a 16-bit FIFO buffer to compensate for the phase delay

introduced by the X.21 device. Figure C-5 illustrates the buffer connection

and the required application setup. When the modem's clock mode is INT

or RCV, the JP2 jumper must be set to INT/RCV (see Figure C-3).

IR-X.21B

MODEM DTE

TXDTXD

TXC

RXC

RXD

Signal Timing

(2, 9)

(4, 11)

(6, 13)

FIFO

Buffer

Figure C-5 INT/RCV Mode Timing Block

1 2 ... 51 52 53 54 55 56 57 58 59 60 61 ... 65 66

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RAD Data comm ASMi-31 Specifikace Strana 56