HMR3000
PIN CONFIGURATION
Pin Number
Pin Name
Description
1 OP/CAL Operate/Calibrate (open = operate)
2 TD Transmit Data, RS-485 (B+)
3 RD Receive Data, RS-485 (A-)
4 RDY/SLP Ready/Sleep Input (open = ready)
5 GND Power and Signal Ground
6 RN/STP Run/Stop Input (open = run)
7 CT/RST Continue/Reset (open = continue)
8 +5V Regulated Power Input (+5 volts)
9 V+ Unregulated Power Input (+6 to +15 VDC)
Pin assignments for 9-pin “D” connector. Power input shall be either regulated +5VDC (pin 8) or unregulated +6 to
+15VDC (pin 9). Only one of the two pins shall be connected in a given installation to prevent HMR3000 damage.
RS-232 UNBALANCED I/O INTERCONNECTS
HOST PC
TD
D
RD
R
GD
RS-485 BALANCED I/O INTERCONNECTS
HOST PC
A-
RD
TD
GD
HMR3000
R
D
HMR3000
D
RD(A)
R
TD(B)
R
D
B+
DATA COMMUNICATIONS
The HMR3000 serial communications are governed by a simple asynchronous, ASCII protocol modeled after the NMEA
0183 standard. Either an RS-232 or an RS-485 electrical interface can be ordered. ASCII characters are transmitted and
received using 1 start bit, 8 data bits (LSB first), no parity (MSB always 0), and 1 stop bit; 10 bits total per character. The
baud rate defaults to 19,200 and can be reconfigured to 1200, 2400, 4800, 9600, 19200, 38400 bits per second. The
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