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SP508CF Datasheet(PDF) 8 Page - Sipex Corporation |
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SP508CF Datasheet(HTML) 8 Page - Sipex Corporation |
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8 / 10 page  rev. 7/7/03 SP508 Evaluation Board Manual © Copyright 2003 Sipex Corporation 8 Driver Enable Dip Switch (off = logic 1, on = logic 0) The individual switches in the off position leaves the individual enable pin floating (in- ternally pulled up or down?) which enables the driver. The switch in the on position ties the high true enable pins to ground and the low true enable pin (LLEN) to VCC thereby disabling the individual drivers. Receiver Enable Dip Switch (off = logic 0, on = logic 1) The individual switches in the off position leaves the individual enable pins floating (internally pulled down or up?) which en- ables the receiver. The switch in the on position ties all of the enable pins to VCC even the high true TMEN. The TMEN pin is always high no matter what position the dip switch is in. To disable the TM receiver the DIP SWITCH USERS GUIDE SP508 DIP SWITCH TRUTH TABLE Switch ON LOGIC OFF LOGIC D0 0 1 DECODER D1 0 1 DECODER D2 0 1 DECODER LOOPBACK 0 1 Logic 0 indicates SP508 is in LOOPBACK mode TERM_OFF 1 0 Logic 1 internal termination is disables D_LATCH 1 0 Logic 0 Latch is disabled SDEN 0 1 Logic 1 TXD driver is enabled TTEN 0 1 Logic 1 TXCE driver is enabled STEN 0 1 Logic 1 ST driver is enabled RSEN 0 1 Logic 1 RTS driver is enabled TREN 0 1 Logic 1 DTR driver is enabled RRCEN 0 1 Logic 1 DCD_DCE driver is enabled RLEN 0 1 Logic 1 SD driver is enabled LLEN 1 0 Logic 0 LL driver is enabled RDEN 1 0 Logic 0 RXD receiver is enabled RTEN 1 0 Logic 0 RXT receiver is enabled TXCEN 1 0 Logic 0 TXC receiver is enabled CSEN 1 0 Logic 0 CTS receiver is enabled DMEN 1 0 Logic 0 DSR receiver is enabled RRTEN 1 0 Logic 0 DCD_DTE receiver is enabled ICEN 1 0 Logic 0 RI receiver is enabled TMEN 0 1 Logic 1 TM receiver is enabled DIP switch must be off and the external pin labeled TMEN is to be jumped to ground. Decoder DIP Switch (off = logic 1, on = logic 0) The decoder DIP switch is configured such that the switch in the off position allows the decoder pins to float as well as the notLOOPBACK pin. (all of these pins are assumed to have internal pull-ups.) The dip switch in the on position grounds each of these pins. DCE_DTE Selectable Switches • Switch bank 1 ON = ST driver outputs tied to TxC receiver inputs and also tied to D- SUB connector for remote evaluation. • Switch bank 2 ON = RRC driver outputs tied to RRT receiver inputs and also tied to D-SUB connector for remote evaluation. |
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