Appendix H: Iris Workstation Rs-232 Interface - Silicon Graphics IRIS Workstation User Manual

Appendix H: IRIS Workstation RS-232 Interface

An IRIS Workstation can be connected to a serial line through
on the Cabinet I/O Panel. These serial ports can be used with terminals
Port 4
(see Sections 4.6 and 6.8), modems (see Sections 4.6 and 6.9) and printers (see
Sections 4.6 and 6.10).
The serial ports on the Cabinet I/O Panel are Data Terminal Equipment (DTE)
type RS-232 ports. The IRIS Workstation asserts the Data Terminal Ready (DTR)
signal on pin 20. This is provided for hosts that expect to see Data Carrier
Detect (DCD) on pin 8 and/or Data Set Ready (DSR) on pin 6. DCD or DSR
signals are not required for a serial line connection.
Figure H-1 shows a three-wire connection for the IRIS Workstation: Transmit
Data on pin 2, Receive Data on pin 3 and Signal Ground on pin 7.
Figure H-2 shows a five-wire connection that can be enabled by connecting pin
20 (Data Terminal Ready) from the IRIS Workstation port to pin 8 (Data Carrier
Detect) on the modem. Then connect pin 20 on the modem to pin 8 on the IRIS
Workstation port.
A full modem can be connected to the IRIS Workstation by connecting each pin
on the modem side to its partner on the IRIS Workstation port. Note that lines
6 (Data Set Ready) and 22 (Ring Indicator) are not required for the IRIS
Workstation.
Version 1.0
RS-232 Pin Definitions
1 Protective Ground (PG)
2 Transmit Data (TD)
3 Receive Data (RD)
4 Request To Send (RTS)
5 Clear to Send (CTS)
6 Data Set Ready (DSR)
7 Signal Ground (SG)
8 Data Carrier Detect (DCD)
20 Data Terminal Ready (DTR)
22 Ring Indicator (RI)
Table H-1: RS-232 Pin Definitions
, or
Port 2 Port 3