7821 User Instructions 23
6.1 Interface Cable
6 Communication
6.1 Interface Cable
The 7821 scale comes factory configured with one communication port, however the
data can be transfered out of the base using one of the following interface devises:
1 serial RS232, 1 USB VCP or 1 USB HID
Only one of these interface devises can be used from the scale at a time.
RS232
There is one 9-pin DE type female connector accessible at the rear of the unit. The
functional pinout of this cable is that of a standard PC which is as follows:
Scale baud and parity needs to be set to the default setting 96E (baud 9600, Parity:
even) as shown in Baud Rate and Parity Options on page 19.
RS232
USB HID
Remote Display
USB VCP
DE-9 Female Scale DE-9 Male Host
Pin Name Direction Pin Name Direction
1. JMP 1 - 1. DCD IN
2. TXD OUT 2. RXD IN
3. RXD IN 3. TXD OUT
4. JMP 1 - 4. DTR OUT
5. SG - 5. GRD -
6. JMP 1 - 6. DSR IN
7. JMP 2 - 7. RTS OUT
8. JMP 2 - 8. CTS IN
9. NC - 9. RI IN
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