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
Summary of Contents for ML3390
Page 1: ...User Manual MICROLINE 3390 3391 IBM EPSON compatible People to People Technology...
Page 3: ...II...
Page 7: ...VI...
Page 347: ...Z 1 Declaration of Conformity CE...
Page 348: ...Z 2 Declaration of Conformity CE...
