PDIU-DS Modem Pool Installation ––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––

PPCT (Modular to DB25) Adaptor, Modified Wiring for Connecting TTY Jack to an External Modem (only if null-modem adaptor is not used with PPTC):

 

 

 

 

PPTC1A-5M Adaptor

Modem

PIOU/PIOUS, TTY Jack

 

RS-232

 

 

 

Modular Pin Number

Modular Pin No.

DB25 Pin No.

Lead Name

1

to

RD

RD,

6 to

2*

TD

2

to

TD

TD,

5 to

3*

RD

3

to

DSR

DSR,

4 to

6

DSR

4

to

DTR

DTR,

3 to

8*

DCD

5

to

DCD

DCD,

2 to

20*

DTR

6

to

SG

SG,

1 to

7

SG

0926

4 Jumper to 5

RTS to CTS

 

Important! *PPTC1A-5M, pins 2 & 3 and pins 8 & 20 must be reversed in the field, as shown, for modem connection. Set Hayes modem to track status of carrier detect signal (AT and C1) and to answer (ATS0 = 1).

Figure 24 External Modem to Strata DK TTY Port Connection

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DKAdmin/DKBackup

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Toshiba DK Admin, DK Backup manual 144, External Modem to Strata DK TTY Port Connection