Section 5: Interface Specifications
LM Basic 408e/412e Operator’s Manual Page 5-5
5.7 READY/BUSY
Ready / Busy is the hardware flow control method for the serial interface on the printer. Data
received cannot be guaranteed, when print data (ESC+"A"~ESC+"Z") is sent from the host,
under the following conditions:
1) When the printer is Offline
2) When an error has occurred in the printer
Pin Assignments
Interface Signals
When using Windows Hardware Control:
1) DB-25 P DB-25 P 2) DB-25P DB-9P
Printer Host Printer Host
FG 1 1 FG FG 1
SD 2 3 RD SD 2 2 RD
RD 3 2 SD RD 3 3 SD
RS 4 5 CS RS 4 8 CS
CS 5 4 RS CS 5 7 RS
DR 6 20 ER DR 6 4 ER
SG 7 7 SG SG 7 5 SG
ER 20 6 DR ER 20 6 DR
3) DB-25 P DB-25 P 4) DB-25P DB-9P
Printer Host Printer Host
FG 1 1 FG FG 1
SD 2 3 RD SD 2 2 RD
RD 3 2 SD RD 3 3 SD
CS 5 20 ER CS 4 4 ER
RS 4 6 DR RS 5 6 DR
DR 6 4 RS DR 6 7 RS
SG 7 7 SG SG 7 5 SG
ER 20 5 CG ER 20 6 CS
Pin no. Signal Type Direction Contents
1 FG - Frame Ground
2 SD Output Send Data
3 RD Input Receive Data
4 RS Output Request to Send
5 CS Input Clear to Send
6 DR Input Data Set Ready
7 SG - Signal Ground
20 ER Output Eqpt Ready (also used for
handling error status)
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