Specifications

CES SUPPORT 407-679-9440 Page 28 MAN78 © CES 1998

[FROM THIS POINT TO THE END OF THE RS232 PORT SECTION IS NOT IMPLEMENTED AT THIS

TIME] If the arbitration type is ‘wait for poll’ the unit saves up received sequences until polled, then it sends one

line. The format of data in this mode is quite different to support polling.

Programming parameters, RS232:

RS232 port, baud rate: Sets the baud rate of the RS232 port. The other serial parameters are fixed at no parity, 8

data bits and 1 stop bit.

[NOT IMPLEMENTED AT THIS TIME] RS232 port, arbitration: Sets the arbitration type for the RS232 port.

If set to ‘send immediately’ received sequences are sent as soon as received. If set to ‘wait for poll’ they are stored

in a queue and sent when polled. Queue size is ≥ 10 received sequences so polling must proceed quickly.

RS232 port, send time and date: Applies to the ‘send immediately’ mode only. If set to yes, received sequences

sent out the RS232 port will be tagged with date and time.

RS232 port, polling address: Sets the address to respond to when being polled. [NOT IMPLEMENTED AT THIS

TIME]

Packet Structure

The structure of each packet is as follows: the first character is always STX ($02), the unit address in ASCII

numeric digits is next, followed by the packet type, then any data, then the ETX ($03) character, then a check sum

which is the sum of the previous bytes in the packet excluding the STX character, sent as 3 ASCII numeric digits,

then the EOT character ($04).

Basic rules for packets are: all characters except STX, ETX and EOT are printable ASCII characters, no spaces

exist and packets from the ARI-190 have lower case text, packets to it have upper case. The check sum data is sent

as an ASCII number, always 3 digits long. Unit address is always 2 digits.

A summary of the polling packets follows.

PC Command Response

POLL (P) queue_item (i) or queue_empty (e)

ALERT_RELAY ® alert_relay ®

REQ_PGM_PARM (A) req_pgm_parm (a) or pgm_err (m)

PGM_PARM (G) pgm_parm (g) or pgm_err (m)

POLL

The poll packet is as follows:

Where:

<STX> is one byte of type 02 hex

<unit address> is the address of the ARI-190 unit to be polled, in ASCII

<ETX> is one byte of type 03 hex

<check sum> is the 8 bit sum of all the previous characters excluding STX

<EOT> is one byte of type 04 hex

When received the ARI-190 will immediately respond with a received sequence or the no poll packet. A received

sequence packet is formatted as follows: