Serial Cables; Rs-232C Connector Pin Assignments; Rs-422A Connector Pin Assignments; Attachment Cables For Pcs And Compatible Serial Ports - IBM 3 User Manual

Serial Cables

The 4247 Printer attaches to a host or controller by one of two serial interfaces,
RS-232C or RS-422A. A single, 25-pin D-connector mounted directly on the adapter
card allows attachment to either interface.
The RS-232C interface uses a standard serial cable up to 15.2 m (50 ft) in length,
with transmission rates up to 19.2 Kbps.
The RS-422A interface uses a serial cable up to 1219 m (4,000 ft) in length, with
transmission rates up to 38.4 Kbps.

RS-232C Connector Pin Assignments

RS-422A Connector Pin Assignments

Attachment Cables for PCs and Compatible Serial Ports

The table below lists part numbers to use when ordering a cable.
Pin Number Signal Name
16 LOGIC GND
17 CHASSIS GROUND
18 Unused
19 - 30 GROUND
31 -INIT
32 -ERROR
33 GROUND
34, 35 Unused
36 -SLCT IN
Pin Number Signal Name
2 TXD
3 RXD
4 RTS
5 CTS
6 DSR
7 SG
20 DTR
Pin Number Signal Name
15 - RXD
17 + RXD
19 - TXD
25 + TXD
Description
Logic Ground
Chassis Ground
Ground
Initialize Printer
Printer Error
Ground
Make printer selected
Description
Transmit Data
Receive Data
Request to Send
Clear to Send
Data Set Ready
Signal Ground
Data Terminal Ready
Description
Receive Data
Receive Data
Transmit Data
Transmit Data
Appendix A. Printer Specifications
333