Interface Card RS 232/422 Operation

RS 232/422 SET-UP:

All serial communication mode changes must be done through serial communications. Mode changes cannot be done through the front panel. To initialize the unit, place a jumper between pin 7(+12V )[bottom board] and pin 1(init) [DB -9 connector] on initial power up. The unit defaults to: 300 baud rate,"MARK" parity and device number 01. To enter the program mode you must set your terminal for 300 baud rate and "MARK" parity. Next, type D1(s), (s)= space bar. The unit will echo back "DEVICE #1:". Now type EP (enter program) and a carriage return (ENTER). The unit will echo back "PROGRAM SETTING". You are now in the program- ming mode.

SETUP PROCEDURE:

The following sections consist of the communications setup options as they appear in the menu. (If you wish to exit the program mode, at any time you can hit the "escape key" (Hex Code: 1B) and the unit will save the changes made but not effect the remaining data values.) When each section of the setup menu is displayed, the current data will appear in the <

>signs. If you wish to change the data, type in the number of the desired choice and press return (ENTER). If you wish to keep the current data, simply press return.

DEVICE NUMBER:

Each unit in the hook-up must be assigned it's own device number (1 to 99). Zero is reserved for a dedicated hook-up to only one terminal, and it's transmit output line remains in an "on" active state. The device number is entered in the program mode. The unit will prompt you:

DEVICE# <XX>?

If XX is the desired device number press return (ENTER), if not enter the desired number after the question mark and press return (ENTER).

BAUD RATE:

The baud rate is the speed at which data is transmitted, expressed in bits per second. Baud rates of 300, 600, 1200, 2400, 4800 or 9600 are available. When in the baud rate section of the menu, the unit will list :

BAUD RATES: 1:300 2:600 3:1200 4:2400 5:4800 6:9600 then prompt you: BAUD RATE <300>?

Press return (ENTER) if this is the desired baud rate or enter the assigned number of one of the six possible baud rates. If an invalid baud rate is entered the unit will prompt you to choose another baud rate. This will occur until a valid baud rate is entered or escape is pressed.

PARITY:

Parity is a bit of information that is inserted before the stop bit and is used to help check if the transmission is correct. When setting the parity you may select "ODD" (parity bit is logic 0 if total number of logic 1's in the first seven data bits is odd),

"EVEN" (parity bit is logic 0 if total number of logic 1's in the first seven data bits is even), "MARK" (parity bit is always logic 1

-High / Mark) or "SPACE" (parity bit is always logic 0 - Low / Space). If a "MARK" parity is chosen, it will appear that two stop bits are used. Use the "MARK" parity with terminals using parity "OFF" or "NONE". These terminals ignore the parity. The unit does not check the parity but does transmit the parity chosen. When setting the parity, the unit will print:

PARITIES:

MARK-0 SPACE-1 EVEN-2 ODD-3 Then the unit will prompt you: PARITY<MARK>?

If this is the desired parity press return (ENTER), if it isn't enter the number of the desired parity then press return (ENTER).

STROBE LIST:

The serial interface card is also equipped with a strobe line. When the strobe line is triggered, a chosen set of data will be transmitted to be displayed or printed. The selections for the display list are entered in the program mode. Enter "1" to add selections to the list and enter "0" to delete selections from the list. The seven available items for the strobe display list are:

(1)Preset A, (2) Preset B, (3) K-Factor A, (4) K-Factor B, (5) Rate of A, (6) Count A, (7) Count B. In the "A net B" mode Count A will display the Net Count and Count B is an invalid command and the unit will transmit useless data. When setting the strobe list the unit will print :

ENTER STROBE LIST:

DO NOT DISPLAY-0 DISPLAY-1 The unit will prompt you:

PRESET A<DISPLAY>? PRESET B<DISPLAY>? K-FACTOR A<DISPLAY>? K-FACTOR B<DISPLAY>? RATE<DISPLAY>?

COUNT A<DISPLAY>? COUNT B<DISPLAY>?

If the above choices are entered, when the strobe line is triggered (3-30V positive pulse) the unit will transmit: DEVICE# 1:

PA XXXXX PB XXXXX KA XXXXX KB XXXXX DR XXXXXX DA XXXXXX DB XXXXXX

(SEE COMMANDS BELOW FOR DESCRIPTION OF COM- MAND CODES).

Each time the strobe line gets triggered the unit will transmit this data unless the program mode is entered and the strobe list altered.

After these four items have been entered they will remain unaltered unless the program mode is entered again and the values changed. The unit is now set and must be addressed by its device number to come on line again.