SELF TEST

Two self-test modes can be selected by DIP switches 3-7 and 3-8. To select a self-test mode, first turn off the power to the printer and then change the DIP-switch setting. When the power is turned back on, the new settings automatically go into effect. To exit from the self test, turn off power and reset the DIP switches.

Table 13. Self-test modes

SW 3-7

SW 3-8

Mode

 

 

 

ON

OFF

Loopback

 

 

 

ON

ON

Line monitor

 

 

 

Loopback mode

Turning the power on during loopback mode causes the interface card to first check the RAM, and then print the RAM capacity and DIP-switch settings. The interface then sends the character codes 30H to 39H, followed by a line feed command (0AH), to the printer eight times.

See Table 14. for the terminal pin connections necessary with your selected interface type.

Table 14. Terminal pin connections

Interface

Transmitting

terminal

pin/

selection

Receiving terminal

pin

 

 

 

RS-232D

Pin No. 2 (TXD) ........................ Pin NO. 3 (RXD)

 

 

 

RS-422A

Pin No. 9 (SDA) ......................... Pin No. 16 (RDA)

 

Pin No. 10 (SDB) ............................. Pin No. 18 (RDB)

 

 

 

Current Loop

Pin No. 17 (TTY-TXD) ....................... Pin No. 25 (TTY-RXD)

 

Pin No. 24 (TTY-TXD Return)

............................... Pin No. 23

 

 

 

(TTY-RXD Return)

 

l In this case, the jumper must be set as follows: J1-A

 

is ON, J2-A is ON, and J3 is ON

 

 

 

 

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