D-23
Appendix D: Interface Data
Term Description
Number of stop bits one or more bits
Transmission protocols three protocols
Interface connection on printer side: 25-pin plug, DB-25S
or equivalent,
on cable side: 25-pin plug, DP-25P
or equivalent
Interface signals see table for interface signals
The interface signals, pin assignment and circuits of the RS-232C
coresident interface are not mentioned again here, as they are like
the simple RS-232C interface, described earlier in this chapter..
Current Loop Interface
Pin Signal Direction Description
1 Protective Ground, PG --- connected to the
printer’s casing
2 - 6 --- --- not assigned
7 Signal Ground, SG --- Signal Ground
8 --- --- not assigned
9 Current Loop, D+ to printer printer receive signal
Receive loop for serial data
10 Current Loop, D- to printer return line for D+ signal
Receive loop
11,12 --- --- not assigned
13 Signal Ground, SG --- Signal Ground
14 - 17 --- --- not assigned
18 Current Loop, B+ from printer printer send signal for
Send loop serial data *
19 Current Loop, B- from printer return line for D+ signal
Send loop
20-25 --- --- not assigned
Pin assignment
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