Motorola MVME2700 Series Manuel de service télécharger pdf (Page 188)

B-4 Computer Group Literature Center Web Site

Serial Interconnections

Interface Characteristics

The EIA-232-D interface standard specifies all parameters for serial binary

data interchange between DTE and DCE devices using unbalanced lines.

EIA-232-D transmitter and receiver parameters applicable to the

MVME2700 are listed in the following tables.

22 RI Ring Indicator. Output from modem to terminal;

indicates that an incoming call is present. The terminal

causes the modem to answer the phone by carrying DTR

true while RI is active.

23 Not used.

24 TxC Transmit Clock (DTE). Input to modem from terminal;

same function as TxC on pin 15.

25 BSY Busy. Input to modem from terminal; a positive EIA

signal applied to this pin causes the modem to go off-hook

and make the associated phone busy.

Table B-2. EIA-232-D Interface Transmitter Characteristics

Parameter Value Unit

Minimum Maximum

Output voltage (with load resistance of

3000

Ω

to 7000

Ω

)

8.5 V

Open circuit output voltage

12 V

Short circuit output current (to ground or

any other interconnection cable conductor)

100 mA

Power-off output resistance 300 W

Output transition time (for a transition

region of –3V to +3V and with total load

capacitance, including connection cable, of

less than 2500pF)

Open circuit slew rate 30 V/µs

Table B-1. EIA-232-D Interconnect Signals (Continued)

Number

Signal

Mnemonic

Signal Name and Description

1 2 ... 183 184 185 186 187 188 189 190 191 192 193 ... 214 215

Commentaires sur ces manuels

Pas de commentaire

Motorola MVME2700 Series Manuel de service Page 188

Commentaires sur ces manuels

Produits connexes et manuels pour PC/postes de travail Motorola MVME2700 Series