6 Serial and 4-20mA output option
(-I2, -A2, -I2R, -A2R, -I4, -A4, -I4R and -A4R options)
This addendum covers instruments with the isolated serial/isolated analog output board. This
board allows output of either RS232 or RS485 plus 4–20mA plus a second relay. The last digits in
the model number, which can be found at the bottom of the label on the instrument case, indicate
the options fitted, option combinations available with this board are show in the table below. Note:
Voltage output is not available with this board. Relays are form C, rated 240VAC, 5A resistive
load. The relay will revert to the normally open (N/O) contact being open when power is removed.
Option code Options fitted to the board
-2I Isolated RS232 serial communication plus isolated 12 bit 4–20mA only output
-2A Isolated 16 bit 4–20mA, 0–10VDC (or 12.5 bit 0–1 VDC) output plus isolated
RS232 serial communication
-2IR Isolated RS232 serial communication plus isolated 12 bit 4–20mA only output
plus second relay (form C, rated at 240VAC, 3A into resistive load)
-2AR Isolated RS232 serial communication plus isolated 16 bit 4–20mA, 0–10VDC (or
12.5 bit 0–1 VDC) output plus second relay (form C, rated at 240VAC, 3A into
resistive load)
-4I Isolated RS485 serial communication plus isolated 12 bit 4–20mA only output
-4A Isolated RS485 serial communication plus isolated 16 bit 4–20mA, 0–10VDC (or
12.5 bit 0–1 VDC) output
-4IR Isolated RS485 serial communication plus isolated 12 bit 4–20mA only output
plus second relay (form C, rated at 240VAC, 3A into resistive load)
-4AR Isolated RS485 serial communication plus isolated 16 bit 4–20mA, 0–10VDC (or
12.5 bit 0–1 VDC) output plus second relay (form C, rated at 240VAC, 3A into
resistive load)
6.1 Electrical Connections
All electrical connections are at the rear of the instrument. The plug in screw connectors used
allow for wire of up to 2.5mm2. Refer to “Electrical Installation” chapter in the main PM5 manual
for general information on electrical connections.
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