Specifications

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 Direction refers to the direction of signal flow as viewed from the printer.
 Return denotes “twisted-pair return” and is to be connected at signal-ground
level. When wiring the interface, be sure to use a twisted-pair cable for each signal
and never fail to complete connection on the return side. To prevent noise effec-
tively, these cables should be shielded and connected to the chassis of the system
unit and printer, respectively.
 All interface conditions are based on Transistor-Transistor Logic (TTL) level. Both
the rise and fall times of each signal must be less than 0.2 microseconds.
 Data transfer must be carried out by recognizing the ACKNLG or BUSY signal.
 The cable must have an overall braided shield, Belden 8345 or equivalent.
 Connectors must have shielded housings. The overall shield must be bonded to
the shielded housings at both ends of the cable.
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This table gives the correct pinouts for the 9-pin male RS-232 serial interface.
Pin Name Pinout View from Printer Interface
1Not Used
2 Receive Data (RXD)
3 Transmit Data (TXD)
4 Data Terminal Ready
(DTR)
5 Signal Ground (GND)
6 Data Set Ready (DSR)
7 Ready To Send (RTS)
8 Clear To Send (CTS)
9 Reserved
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