The lower port is the auxiliary port and can be jumpered for RS-232 or RS-423 operation. This port allows you to attach a terminal locally (or via modem) to DMM. Note: The default is RS-232. See Table 7 on page 42 for the pinout of the cables used for attaching terminals to the auxiliary port.

Table 7.

Auxiliary Port Pinouts

 

 

 

Pin #

 

Signal Name

 

 

 

1

 

Carrier detect (CD)

 

 

 

2

 

Receive data plus (RX+)

 

 

 

3

 

Transmit Data (TX)

 

 

 

4

 

Data terminal ready (DTR)

 

 

 

5

 

Signal ground (SG)

 

 

 

6

 

Data set ready (DSR)

 

 

 

7

 

Request to send (RTS)

 

 

 

8

 

Clear to send (CTS)

 

 

 

9

 

Receive Data Minus (RX-) if RS-423, otherwise no connection

 

 

 

Note

You can attach terminals to both the console and auxiliary port at the same time, and both of them will be able to access the DMM simultaneously.

4.2.3.1 Modems for Connecting Terminals to DMM

The console port and auxiliary port can be used to connect a modem for remote dial-in. The following requirements must be met:

1.The modem must be 100% Hayes compatible.

2.Any of the following baud rates may be used: 300, 1200, 2400, 9600, 19,200 or 38,400

3.The modem must be placed in Dumb/Auto Answer mode. This can be done by entering the commands listed in Table 8 from a terminal directly attached to the modem.

Table 8. Commands Required to Set Up the Modem for the Console Port

Commands #

Definition

 

 

at&f [enter ]

Restore factory defaults

 

 

at&d0 [enter ]

Ignore changes in DTR status **

 

 

a t s 0 = 1 [enter ]

Auto-answer on first ring

 

 

ats0? [enter ]

Verify Auto-answer (should return 001

 

 

atq1 [enter ]

Does not return result codes

 

 

at&W [enter ]

Save this configuration

 

 

at&Y [enter ]

Define this configuration as the default

 

 

at&d2 [enter ]

Indicates hangup and assumes command state when

 

an On to Off transition of DTR occurs **

 

 

**If you issue the Set Terminal Hangup Enable command for modem use, you must change the DTR parameter as defined by the at&d2command to ensure

42 8260 Multiprotocol Intelligent Switching Hub

Page 64
Image 64
IBM 8260 manual Modems for Connecting Terminals to DMM, Pin # Signal Name

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