Microcom 814M Operators Manual - Manual (Page 38)

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6.1.2 RS-232 Serial Interface Signals
Printer serial port signals and status are described in the following table:
6.2 IEEE 1284 Parallel Interface (optional)
6.2.1 Parameters
− Data transmission: 8 bits Parallel
− Synchronization mode: nStrobe signal is provided by exterior
− Handshake mode: Busy signal
− Signal voltage level: TTL compatible
− Connector: 36 pin – Centronics
6.2.2 Parallel Interface Printer Status (/FAULT pin and PE pin)
PIN NO
Signal
name
Signal
direction
function
1 NO
2 RXD input Data input end
3 TXD output Data output end
4 DTR output Data terminal is ready
5 SG — Signal ground
6 DSR input Data device is ready
7 RTS output Request to send
8 CTS input Allow to send
9 FG — Frame Ground
Table 6-1 Serial Interface Signals
Status /FAULT PE
Normal high
low
Paper end low
high
Print head Overheated low
low
Other errors low
low
Table 6-2 /FAULT Pin and PE Explanation