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Details, datasheet, quote on part number:422TTL
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Datasheet text preview:
422TTL2495 - pg. 1/2
Four-Channel RS-422 to TTL Converter
Model 422TTL
Document No. 422TTL2495
The 422TTL unit converts RS-422 signals to TTL signals. Two channels are used to convert from RS-422 to 0-+5 VDC TTL signals and two channels are used to convert from 0-+5 VDC TTL signals to RS-422. A male DB25P connector is provided for the TTL side and a DB25S female connector for the RS-422 side. This converter supports RD, TD, RTS, and CTS. The pins used are:
DB25P Male
TTL Pin TD 9 Function
DB25S Female
RS-422 Pin (output) (output) (input) (input) (output) (output) (input) (input)
(input) ... TD(A) .....2 TD (B) ............ 14 (output) .. ....... RD (A)....3 RD (B)............16 (input) .... ....... RTS (A)...........4 RTS (B)..........19 (output) .. ....... CTS (A)...........5 CTS (B)..........13
RD
14
RTS
16
CTS
23
Pin 7 is signal ground for both connectors of the unit. The unit can work at baud rates up to 115K baud. Open pads are provided for each line. Therefore, if you choose to, you can change the pin connectors for any of the 4 TTL channels. Also, there are pads provided that allow you to change the pin connectors on the RS-422 side. A +12VDC (100 mA) power supply is needed for the unit. B&B Model 422PS can be used for this. The TTL outputs can sink up to 50 mA. Signal levels are inverted by the converter. Please refer to the table below.
POLARITY
TTL Input high low RS-422 Output V (A) - V (B) negative positive RS-422 Input V (A) - V (B) negative positive Units volts volts
TTL Output high low
Units volts volts
© B&B Electronics October 1993
422TTL2495 - pg. 2/2
© B&B Electronics October 1993
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