OPERATOR’S MANUAL
GAC® 2100 Grain Analysis Computer (Blue, Gray, Agri Models)
11001-1688-201609
80 APPENDIX A: COMMUNICATION PORTS
Data Terminal Ready (pin 20) – Indicates the connected device is not
available. The COM1 Control Lead Setup screen configures this line
as ACTIVE or IGNORE. If configured ACTIVE, an OFF condition
(negative or zero voltage) inhibits the transmission of data from the
GAC 2100. Results display but are not buffered for output on COM1. If
not connected, this line should be configured as IGNORE.
NOTE: COM 2 Baud Rate will always
remain at 115200, Data Bits at
8, Parity at None, and Stop Bits
at 1 although the option to
change are in the manual.
COM 2 requires an RS 232 null
modem when connecting to a
computer or printer.
COM2 PIN ASSIGNMENT DETAILS
COM2 (refer to Table 5) is configured as Data Terminal Equipment (DTE).
Protective Ground (pin 1) – Electrically connected to frame.
Transmitted Data (pin 2) – Data is transmitted from this pin.
Received Data (pin 3) – Data is received on this pin.
Table 3. COM1 Connector Pins Identification
Pin Number Designation Signal Name Direction
1 AA Protective Ground NA
3 BB (RxD) Received Data To Device
6 CC (DSR) Data Set Ready To Device
7 AB Signal Ground NA
8 CF (RLSD) Received Line To Device
Signal Detector
11 Busy To GAC 2100
20 CD (DTR) Data Terminal Ready To GAC 2100
Table 4. COM2 Programmable Options
Function Option Hex
Output Format PRN 20
PRN 80
TST 20
PRN 81
CSV 01
PRN 21
Line Terminator LF (Line Feed) 0A
CR (Carriage Return 0D
LF + CR 0A, 0D
CR + LF 0D, 0A
Data Setup 300
Baud Rate 600
1200
2400
4800
9600
19200
Data Bits 7 or 8
Parity None, Even or Odd
Stop Bits 1 or 2
Control MODE Transmit Only
Auto Answer
Control RTS On (+)
Auto
Control DSR Ignore
Active
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