Micromod Micro-DCI: 53ML5100A LOADING STATION REV. 1 FIRMWARE - Manual (Page 17)

53ML5100A Manual Loading Station
Supplement to the Instruction Bulletin
Datalink Communications 13
4.3 SOFTWARE CHARACTERISTICS
1. Transparency Rule - whenever 7E hexaecimal is transmitted as anything other than SOH,
a 00 byte will be inserted directly following it (byte stuffing).
2. All transactions are initiated by the host personal computer.
3. All instruments begin their response within 10 ms after the end of the transmission by the host
personal computer; otherwise, a faulty transmission may be assumed.
4. Illegal messages received by the instruments are ignored.
5. The maximum number of data bytes per message is 20
H
(32 decimal).
4.4 HARDWARE CHARACTERISTICS
1. Transmission Speed - standard rates are 110 - 28800 baud.
2. Asynchronous by character.
3. A character is:
4. The line is 4-wire, shielded twisted pair, type RS-422/485.
4.5 INITIALIZATION MESSAGE
If datapoints A188 and A189 are configured to NON-NULL values, their contents will be transmitted onto
the Datalink network at reset/power-up. Prior to transmitting, a delay based on the unit’s instrument
address is observed. There is a one second delay between the transmission of datapoint A188 and
datapoint A189 contents. Datapoints A188 and A189 can be configured as two NULL TERMINATED
strings up to 10 characters each. For example, to initialize a Hayes-compatible modem to Auto Answer,
datapoint A188 would be configured through the faceplate push buttons to appear as follows:
A188
L
ATS0=4
C
R
This seven-character string is an Auto Answer command that directs the modem to respond to calls on the
fourth ring. It is an AT command that loads the modem S0 register with a 4 to indicate a modem response
on the fourth ring. Any value other than 0 in this modem register activates Auto Answer. The NULL
TERMINATING values are automatically propagated into the remainder of the datapoint field by the con-
troller. Datapoint A189 can be left at all NULL VALUES for this operation.
1 Start bit.
8 Data bits - the Least Significant Bit (LSB) is transmitted first.
1 Even Parity bit.
1 Stop bit.