Series EJ, ET, EY, FJ & FR
102002-177 Rev M2
51
\1020\02177M2.doc 17 Jun 2019
RESPONSE PACKET (“R”)
The 16 byte Response Packet will be returned to the computer in response to a valid
Query command. It will contain status information in the following order:
Note that the analog monitors have 10 bit resolution, therefore, full scale is
represented in hexadecimal as 3FF. The checksum is calculated on bytes
2 through 13.
The 12 digital monitor status bits are sent as three ASCII characters. The bit
assignments are as follows:
Byte 11:
Bit 0 Control Mode: Voltage Mode = 0, Current Mode = 1
Bit 1 Power Supply Fault (1 = Fault)
Bit 2 HV On Indicator (1 = on)
Bit 3 Unused=
Byte 12:
Bit 0 Unused=
Bit 1 Unused=
Bit 2 Unused =
Bit 3 Unused =
Byte 13:
Bit 0 Unused =
Bit 1 Unused =
Bit 2 Unused =
Bit 3 Unused =
For example, a monitored voltage of Vmax will correspond to 3FF hex, sent with
ACII encoding as follows:
Byte 2:
33 hex (00110011 binary)
Byte 3:
46 hex (01000110 binary)
Byte 4:
46 hex (01000110 binary)
BYTE #
DESCRIPTION
1
Response identifier character “R”
2-4
Voltage monitor(0 – Vmax) corresponds to (0 – 3FF) hex.
5-7
Current monitor(0 – Imax) corresponds to (0 – 3FF) Hex.
8-10
Reserved, Set to 0 decimal = 30 hex.
11-13
Digital monitors (12 bits encoded in three ASCII bytes)
14-15
Modulo 256 checksum of bytes 2 –13
16
End of message character (carriage return, hex 0D)
Table 7. Response Packet Byte Contents
