J2: Parallel Port Connector; J4, J5: Com1 And Com2 Serial Ports Connector - Intel IB850 User Manual

J2: Parallel Port Connector

The following table describes the pin out assignments of this connector.
Line printer strobe
PD0, parallel data 0
PD1, parallel data 1
PD2, parallel data 2
PD3, parallel data 3
PD4, parallel data 4
PD5, parallel data 5
PD6, parallel data 6
PD7, parallel data 7
J2
ACK, acknowledge

J4, J5: COM1 and COM2 Serial Ports Connector

J4 and J5 both 10-pin headers, are the onboard serial port connectors.
J4
Fixed as
RS-232
J5
Configurable
as RS-232/
RS-422/485
with jumpers
JP2/JP3/JP4
Signal Name
Busy
Paper empty
Select
Pin #
RS -232
1 DCD
2 RX
3 TX
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 RI
10 NC
IB850 User's Manual
INSTALLATIONS
Pin # Pin #
1 14
2 15
3 16
4 17
5 18
6 19
7 20
8 21
9 22
10 23
11 24
12 25
13 N/A
Signal Name
RS -422
TX-
TX+
RX+
RX-
GND
RTS-
RTS+
CTS+
CTS-
NC
Signal Name
AutoFeed
Error
Initialize
Select
Ground
Ground
Ground
Ground
Ground
Ground
Ground
Ground
N/A
RS -485
DATA-
DATA+
NC
NC
GND
NC
NC
NC
NC
NC
25