Lexmark 4I3 - Manual (Page 295)

|
Appendix E. Cabling Information
|
Serial Attachment (Models 4I3 and 5I3)
| The 4230 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
| Pin
| Number
| Signal
| Name
| Description
| 2 | TXD | Transmit Data
| 3 | RXD | Receive Data
| 4 | RTS | Request to Send
| 5 | CTS | Clear to Send
| 6 | DSR | Data Set Ready
| 7 | SG | Signal Ground
| 20 | DTR | Data Terminal Ready
| RS-422A Connector Pin Assignments
| Pin
| Number
| Signal
| Name
| Description
| 15 | - RXD | Receive Data
| 17 | + RXD | Receive Data
| 19 | - TXD | Transmit Data
| 25 | + TXD | Transmit Data
Copyright IBM Corp. 1991, 1994 E-1